Answer:
30°
Step-by-step explanation:
∠A + ∠B + ∠C = 180
∠B = ∠A + 20
∠C = 2 * ∠B
<A + (∠A + 20) + (2 * ∠B) = 180
<A + (∠A + 20) + (2 * (∠A + 20)) = 180
<A + (∠A + 20) + 2∠A + 40 = 180
4∠A + 60 = 180
4∠A = 120
∠A = 30
Answer:
b.
Step-by-step explanation:
Answer:
The line AB is a tangent of the circle with center C.
No, for example 8-1. If you do the Commutative property, it would be 1-8; which would be a negative number. Associate property is basically the same thing; so no, you can't.