Question

1,2,5 please I don’t really understand this lesson :(:/
AKA 1,2,5 only!

Answer 1

Explanation:

Volume of a triangular pyramid =
`(1)/(3)(\text{Area of the triangular base})(\text{Height})`

1). Volume of the pyramid =
`(1)/(3)(72)(15)`

= 360 cm³

2). Volume of the pyramid =
`(1)/(3)(\text{Area of the triangular base})(\text{Height})`

Area of the triangular base =
`(1)/(2)(\text{Base})(\text{height})`

=
`(1)/(2)(8)(5)`

= 20 cm²

Therefore, volume of the pyramid =
`(1)/(3)(20)(12)`

= 80 cm³

5). Volume of the cone =
`(1)/(3)\pi r^(2)h`

Here, r = radius of the circular base

h = Height of the cone

Volume of the cone =
`(1)/(3)\pi (2)^2(4)`

=
`(16\pi )/(3)`

= 16.76 cm³