Question

What is the surface area of a sphere with a radius of 20 m

Answer 1

the formula for the surface area of a sphere is

\[SA = 4 \times \pi \times r^2\]

just substitute the value 20 and calculate it out

Answer 2

5024 ?

Answer 3

its not on my answer choices

Answer 4

this are my answer choices :

A.) 800π m2
B.) 1,600π m2
C.) 200π m2
D.) 400π m2

Answer 5

your math was wrong, because the formula is correct

Answer 6

4*pi*r^2 = 4(pi)(20^2) = 4 * 400 * pi

Answer 7

4 x 400 x 3.14 ?

Answer 8

if you look at you're answers you need an exact value... so its

\[Sa = 4 \times 20^2 \times \pi\]

leave the answer in terms of pi... don't use 3.14

Answer 9

so its b ?

Answer 10

thats correct

Answer 11

thanks :)