Since you already know the radius multiply it by itself(20*20=400)then multiply that amount by 3.14.(formula: 3.14*(radius*radius)
They are 1st one is vertical angles, second one is complementary
Answer:
21/4
Step-by-step explanation:
(5 * 4) + 1
20 + 1
21/4
A + 2A = 180
3A = 180
A = 60
2A = 120A