# Interpreting angles

8 videos

6 skills

Now that we know what angles are, let's dig a bit deeper and classify them and understand their properties better. Acute, obtuse, right, adjacent--all are angles that we will be become familiar with. We'll all also examine how intersecting lines play a role. Lots of great stuff in this tutorial, so pull up a chair and get your angle on! Common Core Standards: 4.MD.C.7, 4.G.A.1

### Acute right and obtuse angles

VIDEO
5:32 minutes

We briefly discussed the types of angles in the last tutorial but we'll delve a little deeper into acute, obtuse, and right angles here.

### Measuring angles in degrees

VIDEO
8:22 minutes

Let's come up with an exact way to measure an angle using a protractor. We'll also learn about acute angles. Not to be confused with augly angles :)

### Angle types

PRACTICE PROBLEMS

Determine if an angle is acute, right, or obtuse. A protractor is provided.

### Recognizing angles

VIDEO
2:15 minutes

Let's do a few example exercises in which you recognize and identify the type of given angle. This is a lot of fun!

### Recognizing angles

PRACTICE PROBLEMS

Determine if angles in shapes and pictures are acute, right, or obtuse.

### Drawing acute, right and obtuse angles

VIDEO
2:40 minutes

These 3 types of angles will often come up in your geometry studies. Let's make sure you know how to draw an acute, obtuse, and right angle.

### Drawing right, acute, and obtuse angles

PRACTICE PROBLEMS

Create an acute, right, or obtuse angle using a given vertex.

### Identify the angle example

VIDEO
2:03 minutes

We're matching the visual angle with the corresponding angle measure. Great practice. See if you do it on your own before listening to Sal!

### Parallel and perpendicular lines intro

VIDEO
2:08 minutes

Do the two lines intersect or stay apart? If they intersect, do they do so thereby creating a 90 degree angle? These are the kinds of questions we ask ourselves when we learn about parallel and perpendicular lines.

### Identifying parallel and perpendicular lines

VIDEO
3:35 minutes

Let's now apply what we learned and do an exercise together in which we identify parallel and perpendicular lines.This is great practice.

### Recognizing parallel and perpendicular lines

PRACTICE PROBLEMS

Identify parallel and perpendicular lines in geometric figures and pictures.

### Solving for an angle

VIDEO
1:43 minutes

Let's use a little math with our geometry and see if we can solve for a mystery angle. In this example we know the adjacent angle AND the combination of the mystery angle and the adjacent angle. Mystery angle...how big are you?