A
Two or more angles are __________ if the sum of their measures is 180 degrees.
Supplementary
Two angles are ________ angles if their sides form two pairs of opposite rays. These angles are congruent.
Vertical
How do you calculate the area of a circle?
Circumference = 2πr
Area = πr²
Two or more angles are ________ if the sum of their measures is 90 degrees.
Complementary
These angles share a common endpoint and side.
Adjacent angles
If we are given the diameter of a circle and need the radius, what do we need to do?
Example: we have a diameter of 8
You divide the diameter by 2 to get the radius, so the radius of a circle with a diameter of 8 would be 4.