Vertical angles are angles opposite each other. Since there are 12 angles and they are all pair of vertical angles. Therefore, you just divide 12 by 2 which is 6
The two angles are located on the same line. The measure of a line is always 180° so to find out the measurement of the other angle (angle 5) you need to subtract 72° from 180°. 180° - 72° = 108°
Vertical angles have the same measurement. Angle 1 and Angle 4 are vertical angles so the measurement of angle 1 will also be the measurement of angle 4 which is 38°
Complementary angles are angles with the sum of 90°. Thus, to find its complement you should subtract the angle measurement to 90°. 90° - 52.5° = 37.5°
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