Question

Question 7
Find the surface area of the sphere with a circumference of 30 cm.
r
-
S.A. = [a] cm Round to 1 decimal place.​

Answer 1

Answer:

286.36 cm.sq.

Step-by-step explanation:

circumference of sphere = 2πr

30 = 2πr

30/2π. = r

surface area of sphere = 4πr×r

= 4π× 30/2π × 30/2π

= 30×30/π

= 900×7/22. (π = 22/7)

= 286.36 cm.sq.