Types of Angles Free Math Help
In the above picture, angles 1 and 3 and angles 2 and 4 are vertical because they are across from each other. Now, angles 1 and 2 and angles 3 and 4 are NOT vertical angles. Complementary Angles Two angles whose measures add up to 90 degrees. Sample: angle A = 30 degrees and and angle B = 60 degrees. Then angle A + angle B = 90 degrees.