Do we need math in our life mostly people dont use it in the modern world only high tec jobs do

math is the foundation of everything. think about it you need to know how many dollar socks you can get, the amount of tip to leave, or even what your Christmas gifts will cost.

This is very helpful! Does this work for all triangles?

_Yes! it works for all triangles!_

why do you want to find area of a triangle

Finding the area of a triangle by itself may often not feel like a very useful skill, but to understand math concepts like calculus and trigonometry, you need to start somewhere, and that place won't be the very top. Like MCFCguy stated: "_Whether we like math or not, math is influencing our daily lives. Let's imagine a world without math. Our currencies wouldn't function because they would all just be pieces of paper of equal value without numbers on them. Buildings would not stand up straight and would almost certainly cause casualties because we would have no concept of angles. Our roads would not be straight because we don't know anything about geometry or trigonometry. We wouldn't have internet or phones or computers. Which would mean no Khan Academy. We wouldn't have boats, cars, or airplanes. And we certainly wouldn't have spacecrafts. But even if we did, we would never figure out how to launch them effectively every time. So, in short, even if you hate math, if it didn't exist, we would have almost none of the modern conveniences that we have grown accustomed to._" Isaac Newton (and the other German dude) weren't just sitting under an apple tree when he got hit in the head with an apple (I know he didn't actually get hit in the head with an apple) and suddenly was granted the knowledge of the equation for gravity, or just invented calculus without knowing anything about math. If you wan't to _discover_ new things, _invent_ new things, _create_ new things, it won't be as soon as you get hit in the head with an apple. You will _need_ to understand math, in _any_ job that is legitimately contributing to humanity. I am not saying every job requires you to understand calculus and special relativity, but you _do_ need math. In conclusion, Humanity has sent rockets to space, because of complex math. That complex math only exist because of simple things like this. We need to be able to find the area of a triangle, so that we can learn trigonometry. So that we can send rocket to space. Colonize Mars. Build Stellar Engines.

do you have to divide it by two

if you dont you are technically doing normal rectangle area

is there any other formula which can be used to find an area of a triangle

1) abc/4R (R is radius of circumscribed circle) 2) r/2×(a+b+c) (r is radius of inscribed circle) 3) If you know the coordinates of the three points, use the shoelace formula 1/2×|x₁y₂+x₂y₃+x₃y₁-x₂y₁-x₃y₂-x₁y₃|

the triangles are hard to do sometimes.

yea but youjust have to do it a ot

I will accept all the help I can get because I can really make use of it.

Use the formula base (usually the bottom part of the triangle) times the height (the distance from the very top point of the triangle down to the middle of the base) divided by 2. Usually the height is represented as a dotted line.

I dont understand what to do after you mutiply

After you multiply the base and height of the triangle, you have a parallelogram that is twice the size of the triangle you started out with. To get the area of your triangle and not this parallelogram, you have to divide by 2. You might be interested in this Khan Academy video, which tells you why the formula for a triangle is the way it is - https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/geometry-area-triangle/v/triangle-area-proofs

why did you make this so annoying and dumb

mabe u should watch the video its simple really

Area of triangles (article) | Foundations

Main content

Algebra basics

Unit 1: Lesson 9

Area of triangles

CCSS.Math:

6.G.A.1

Google Classroom

Intuition for why the area of a triangle is one half of base times height.

Intuition for why the area of a triangle is A, equals, start fraction, 1, divided by, 2, end fraction, b, h

To see why the formula makes sense, drag the dot all the way to the right:

Whoa! You made a rectangle that's twice as big as the triangle! The area of the rectangle is b, h, equals, 4, times, 5, equals, 20 square units, so the area of the triangle is start fraction, 1, divided by, 2, end fraction, b, h, equals, start fraction, 1, divided by, 2, end fraction, times, 4, times, 5, equals, 10 square units.

Key intuition: A triangle is half as big as the rectangle that surrounds it, which is why the area of a triangle is one-half base times height.

Practice problem 1

What is the area of the triangle?
Drag the dot to help you remember the formula.

unitssquared

Practice problem 2: right triangle

What is the area of the triangle?
Drag the dot to help you remember the formula.

unitssquared

Practice problem 3: one vertex is hanging over the side

What is the area of the triangle?
Drag the dot to help you remember the formula.

unitssquared

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Want to join the conversation?

Stephanie Pearce
Posted 5 years ago. Direct link to Stephanie Pearce's post “Do we need math in our li...”
Do we need math in our life mostly people dont use it in the modern world only high tec jobs do
(122 votes)
Answer
- Olivia Carpenter
  Posted 4 years ago. Direct link to Olivia Carpenter's post “math is the foundation of...”
  math is the foundation of everything. think about it you need to know how many dollar socks you can get, the amount of tip to leave, or even what your Christmas gifts will cost.
  (63 votes)
maryannefalli
Posted 5 years ago. Direct link to maryannefalli's post “This is very helpful! Do...”
This is very helpful! Does this work for all triangles?
(91 votes)
Answer
- Klemmie
  Posted 2 months ago. Direct link to Klemmie's post “_Yes! it works for all tr...”
  Yes! it works for all triangles!
  (13 votes)
LilD
Posted 5 years ago. Direct link to LilD's post “why do you want to find a...”
why do you want to find area of a triangle
(22 votes)
Answer
- Slushie
  Posted 3 years ago. Direct link to Slushie's post “Finding the area of a tri...”
  Finding the area of a triangle by itself may often not feel like a very useful skill, but to understand math concepts like calculus and trigonometry, you need to start somewhere, and that place won't be the very top. Like MCFCguy stated:
  
  "Whether we like math or not, math is influencing our daily lives. Let's imagine a world without math. Our currencies wouldn't function because they would all just be pieces of paper of equal value without numbers on them. Buildings would not stand up straight and would almost certainly cause casualties because we would have no concept of angles. Our roads would not be straight because we don't know anything about geometry or trigonometry. We wouldn't have internet or phones or computers. Which would mean no Khan Academy. We wouldn't have boats, cars, or airplanes. And we certainly wouldn't have spacecrafts. But even if we did, we would never figure out how to launch them effectively every time. So, in short, even if you hate math, if it didn't exist, we would have almost none of the modern conveniences that we have grown accustomed to."
  
  Isaac Newton (and the other German dude) weren't just sitting under an apple tree when he got hit in the head with an apple (I know he didn't actually get hit in the head with an apple) and suddenly was granted the knowledge of the equation for gravity, or just invented calculus without knowing anything about math. If you wan't to discover new things, invent new things, create new things, it won't be as soon as you get hit in the head with an apple. You will need to understand math, in any job that is legitimately contributing to humanity. I am not saying every job requires you to understand calculus and special relativity, but you do need math.
  
  In conclusion, Humanity has sent rockets to space, because of complex math. That complex math only exist because of simple things like this.
  
  We need to be able to find the area of a triangle, so that we can learn trigonometry. So that we can send rocket to space. Colonize Mars. Build Stellar Engines.
  (57 votes)
myaphill1
Posted 4 years ago. Direct link to myaphill1's post “do you have to divide it ...”
do you have to divide it by two
(12 votes)
Answer
- Allixxison AKA Imposter !
  Posted 2 years ago. Direct link to Allixxison AKA Imposter !'s post “if you dont you are techn...”
  if you dont you are technically doing normal rectangle area
  (3 votes)
palwasha.asif
Posted 5 years ago. Direct link to palwasha.asif's post “is there any other formul...”
is there any other formula which can be used to find an area of a triangle
(12 votes)
Answer
- Elmion
  Posted 2 years ago. Direct link to Elmion's post “1) abc/4R (R is radius of...”
  1) abc/4R (R is radius of circumscribed circle)
  2) r/2×(a+b+c) (r is radius of inscribed circle)
  3) If you know the coordinates of the three points, use the shoelace formula
  1/2×|x₁y₂+x₂y₃+x₃y₁-x₂y₁-x₃y₂-x₁y₃|
  (2 votes)
Shannon Ritchie
Posted 4 years ago. Direct link to Shannon Ritchie's post “the triangles are hard to...”
the triangles are hard to do sometimes.
(8 votes)
Answer
- heilbel
  Posted 2 months ago. Direct link to heilbel's post “yea but youjust have to d...”
  yea but youjust have to do it a ot
  (2 votes)
Elijah Blackmon
Posted 3 years ago. Direct link to Elijah Blackmon's post “I will accept all the hel...”
I will accept all the help I can get because I can really make use of it.
(5 votes)
Answer
- Bradley Swalberg
  Posted 3 years ago. Direct link to Bradley Swalberg's post “Use the formula base (usu...”
  Use the formula base (usually the bottom part of the triangle) times the height (the distance from the very top point of the triangle down to the middle of the base) divided by 2. Usually the height is represented as a dotted line.
  (4 votes)
Taylor :]
Posted 2 years ago. Direct link to Taylor :]'s post “I dont understand what to...”
I dont understand what to do after you mutiply
(4 votes)
Answer
- Hecretary Bird
  Posted 2 years ago. Direct link to Hecretary Bird's post “After you multiply the ba...”
  After you multiply the base and height of the triangle, you have a parallelogram that is twice the size of the triangle you started out with. To get the area of your triangle and not this parallelogram, you have to divide by 2.
  You might be interested in this Khan Academy video, which tells you why the formula for a triangle is the way it is - https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/geometry-area-triangle/v/triangle-area-proofs
  (6 votes)
ayse.sahingoz
Posted 3 years ago. Direct link to ayse.sahingoz's post “i feel like monkeys can s...”
i feel like monkeys can solve this but not me XD jk
(6 votes)
Answer
2028ethanyork
Posted a year ago. Direct link to 2028ethanyork's post “why did you make this so ...”
why did you make this so annoying and dumb
(4 votes)
Answer
- heilbel
  Posted a month ago. Direct link to heilbel's post “mabe u should watch the v...”
  mabe u should watch the video its simple really
  (3 votes)

Algebra basics

Unit 1: Lesson 9

Intuition for why the area of a triangle is A=12bhA=\dfrac{1}{2}bhA=21​bhA, equals, start fraction, 1, divided by, 2, end fraction, b, h

Practice problem 1

Practice problem 2: right triangle

Practice problem 3: one vertex is hanging over the side

Want to join the conversation?

Intuition for why the area of a triangle is A, equals, start fraction, 1, divided by, 2, end fraction, b, h