Question

A toy ball has a diameter of 10.04 inches. What are its volume and surface area?

Answer 1

http://0.tqn.com/d/math/1/0/I/F/spherer.gif

Answer 2

"r" means radius, there, so you know :)

Answer 3

And since the problem gives me a diameter, can I just use that as the radius?

Answer 4

well, isn't there a correspondence between the radius and diameter?

Answer 5

Well diameter is all the way around the sphere whereas radius is just the length from the center, right?

Answer 6

yes

Answer 7

if you draw a radius from the center to the arc on one direction,
then another on the opposite direction

you'll notice that those 2 radius look suspiciously like a diameter

Answer 8

So how would you find the radius from the diameter? Divide the diameter by two?

Answer 9

yes

Answer 10

So the radius would be 10.04/2 which is 5.02.

Answer 11

yes

Answer 12

then you just plug that in the formulas

Answer 13

Thank-You! :-)

Answer 14

yw