Answer:
Step-by-step explanation:relax and claculate in ur mine
the radius: r^2 = 81
r =9
c = 2*pi*r
= 2 * pi * 9
= 18 *pi
Answer: 18*pi or approximately 56.62
-8.57142857143
Step-by-step explanation:
y/3 = h
Multiply both sides by 3:
y = 3h