Question

Kwame's team will make two triangular pyramids to decorate the entrance to the exhibit. They will be wrapped in the same metallic foil. Each base is an equilateral triangle. If the base has an area of about 10.8 square feet, how much will the team save altogether by covering only the lateral area of the two pyramids? The foil costs $0.24 per square foot.

Answer 1

Therefore the team saves $5.18.

Explanation:

i) there are two triangular pyramids

ii) the base of each pyramid is an equilateral triangle with an area of 10.8 square feet.

iii) the base of the pyramids are not covered with foil.

iv) since there are two pyramids the total area not covered

= 10.8
`*` 2 = 21.6 square feet

v) the cost of foil = $0.24 per square foot.

vi) the team save altogether by covering only the lateral area of the two pyramids

= 21.6
`*` 0.24 = $5.18

Therefore the team saves $5.18.