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## Geometry (all content)

### Course: Geometry (all content) > Unit 3

Lesson 4: Curves and polygons# Intro to curves

In daily language, we all use the word curve to mean "not straight" but does the word curve have the same meaning in math? Can a straight line be a curve? Also, what makes a curve a 'simple curve'? Created by Aanand Srinivas.

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- At the last , I would call it an Open Curve , because it is not closed or does not start from one point and end at the same point later. Do you agree?(5 votes)
- wow.i never knew THIS existed!(2 votes)
- oh and the question, the spiral is a simple ,and is not crossed.(1 vote)
- Definition of curve is "A curve is a shape or a line which is smoothly and continuously drawn in a plane having a bent or turns in it". So according to the definition of curve, can we say that any 2D shapes or plane figures are also a curve in geometry?(1 vote)
- Can we say that any 2D shapes or plane figures are also a curve?(1 vote)
- If I am right Curve is a line with start and end with no gaps .
**Is straight line is curve ? or we are talking about line segment**

cause straight line has no start and end but line segment have .(1 vote) - how to find that it is a open curve or closed cure(1 vote)
- soooo.... the straight line is curve or not, this has confused me...(0 votes)
**no because it is a straight line**(0 votes)

`Is there a more sophisticated way to say "not" simple curve?`

At4:14, it's mentioned that there is, but WHAT IS IT?(1 vote)- I thought this was going to be curves on a graph?(1 vote)