Question

The formula can be used to find the volume of a rectangular pyramid whose base area is b square units and whose height is h units.

What is the height of a pyramid whose volume is 360 cm3 and whose base area is 72 cm2?

_________ cm

Answer 1

Do you know the formula for volume of a pyramid?

Answer 2

V=lwh/3

Answer 3

Yep, so we can substitute what we already know into that.

Answer 4

l*w is equal to the base area.

Answer 5

So now we have \(\bf 360=\dfrac{72*h}{3}\)

Answer 6

What do we do to get rid of the 3?

Answer 7

no idea

Answer 8

Multiply both sides by 3.

Answer 9

What is 360*3?

Answer 10

1080

Answer 11

Yes, now we have \(\bf 1080=72*h\). What do you think we do to get rid of 72?

Answer 12

Remember, use the opposite operation of multiplying.

Answer 13

divide it by 3?

Answer 14

3 is gone now.

Answer 15

You have the right idea, divide, but the incorrect number.

Answer 16

divide by 72?

Answer 17

Yep

Answer 18

What do you get when you divide by 72?

Answer 19

0