Answer:
see explanation
Step-by-step explanation:
The surface area (A) of a sphere is calculated as
A = 4πr² ← r is the radius, here r = 9, thus
A = 4π × 9² = 4π × 81 = 324π ≈ 1017.9 units²
Answer:
A. 7pi>21
Step-by-step explanation:
7*pi=21.99
21.99>21
Answer:
point form: (2,-1)
equation form: x=2,y=-1
Step-by-step explanation: