Question

A ball has a diameter of 8 inches. What is its surface area? (Use 3.14 for π.)

200.96 in.2
803.88 in.2
401.92 in.2
100.48 in.2

Answer 1

Use the formula

SA = 4pi*r^2

where

SA = surface area
pi = 3.14 (roughly)
r = radius

Answer 2

keep in mind that

r = d/2

r = radius
d = diameter

Answer 3

so u do 8X3.14

Answer 4

8 isn't the radius

Answer 5

the radius is 8/2 = 4, so r = 4

Answer 6

SA = 4pi*r^2

SA = 4*3.14*4^2

SA = ??

Answer 7

100.48

Answer 8

no

Answer 9

4^2 does NOT mean 4 times 2

Answer 10

4^2 means "4 squared"

Answer 11

200.96

Answer 12

better