Question

volume question

Answer 1

"Two square pyramids have the same volume."
This means the both pyramids should have an equal volume. Correct?

Answer 2

yes

Answer 3

Do you remember the volume of a square pyramid?
V = 1/3 * base * height

Answer 4

yes

Answer 5

...

Answer 6

V = (1/3)*b ^2*h
where
V = volume
b = the base edge it's squared because this base edge we're looking at is a square
h = the height

Answer 7

(1/3)*20^2 * 21 =(1/3) b^2 * 84
solve for b^2

Answer 8

I'm not sure...

Answer 9

(1/3)*20^2 * 21 is for the first pyramid
(1/3) b^2 * 84 for the second pyramid
"Two square pyramids have the same volume."
so, (1/3)*20^2 * 21 =(1/3) b^2 * 84

Answer 10

let's try this and see how it goes

Answer 11

Should I just do the left side of the equal sign into my calculator?

Answer 12

I'm not understand how you solve for b^2

Answer 13

yes and divide the result by 84

Answer 14

I got 33.3? I don't know..

Answer 15

V = b ^2*h

20^2*21=b^2*84

Answer 16

you would get x=10

Answer 17

Hmm okay I see how you did it kinda... I'll have to go through it a bunch of times again.