C.
90 + 2x = 180
Solve that and x is answer
Answer:
c = 81.7 m
Step-by-step explanation:
a = πr²
530.93 = πr²
r² = 530.93/π
r² = 169
r = 13
----------------------
c = 2πr
c = 2π(13)
c = 81.7
Answer:
A. b+5
B.3(b+5)
C.b+5+8b=9b+5
Step-by-step explanation: