Asked by Anonymous
Find the total surface area of a square pyramid with a base length of 18 and height of 12
Answers
Answered by
drwls
What are the units that go with your numbers? Meters? Miles? Whetever?
The base area is 18x18 whatevers.
You need the lateral height h of the four triangular sides, measured from the midpoint of one of the base sides to the apex. You can get that using the Pythagorean theorem.
h^2 = 9^2 + 12^2
h = 15
One Side area = (1/2)bh = (1/2)*12*15 = 90
Add up the five side areas for the total.
The base area is 18x18 whatevers.
You need the lateral height h of the four triangular sides, measured from the midpoint of one of the base sides to the apex. You can get that using the Pythagorean theorem.
h^2 = 9^2 + 12^2
h = 15
One Side area = (1/2)bh = (1/2)*12*15 = 90
Add up the five side areas for the total.
Answered by
Dj
the surface area of a prism is 120 sqaure cm and the area of each base is 32 square cm find the lateral area of the prism.
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