Question

A rectangular pyramid fits exactly on top of a rectangular prism. The prism has a length of 12 in., a width of 4 in., and a height of 5 in. The pyramid has a height of 10 in. Find the volume of the composite space figure.
480 in.^3
300 in.^3
2400 in.^3
400 in.^3

Answer 1

12*4*5=240^2 -For the Rectangle, can you show me how to get the pyramid?

Answer 2

See http://www.basic-mathematics.com/volume-formulas.html
for a list of formulas for the volume of various figures.

volume of a pyramid is 1/3 * area of base * height

Answer 3

12*4=base?

Answer 4

yes, I believe the area of the pyramid's base is 48

Answer 5

48*1/3*5=Area?

Answer 6

= volume

Answer 7

80in^3!

Answer 8

80+240= Answer! :D (Right?!)

Answer 9

that adds to 320, and I don't see that as one of your choices.

Answer 10

48*1/3*10=V Wrong height... :P

Answer 11

160^3!

Answer 12

Answer is 400^3? :D

Answer 13

yes, that looks good

Answer 14

Thankz! :D