Question

The circumference of a spherical head of lettuce is 12π in. Find the surface area of the head of lettuce. Express your answer in terms of π.

Answer 1

we know that

[surface area of a sphere]=4πr²

length of a circumference=2πr
r=length of a circumference/(2π)------> 12π/2π-------> 6 in

so
[surface area of a sphere]=4π6²----------> 144π in²

the answer is 144π in²