Hands-on math!


An angle is formed when two straight lines meet. The spot they meet at is called the vertex.
Angles are measured in degrees. A few examples will show you how to measure angles:
The sides of a square meet at 90 degrees: (The little square means 90 degrees)

Here, the two lines meet at 30 degrees:

Here's an obtuse angle of 155 degrees:
Now, here's a problem for you:
What angle do these lines meet at?
Hint: It's half of the 90 degree angle!