What kind of angle is pictured?

What does the word "parallel" mean?

What does the word "perpendicular" mean?

What is the name of the theorem involving right triangles that reads: $a^2+b^2=c^2$   

What do the three angles in a triangle add up to?

What does the following equation tell you about a line? $m=\frac{y_2-y_1}{x_2-x_1}$   

The distance around the outside of a shape is the shape's ____________________.

The following formula calculates the area of what shape? $A=\pi r^2$