Asked by landon
An equilateral triangular pyramid has a slant height of 8.3 inches. The triangular base has a perimeter of 4.8 inches and an area of 1.1 square inches. Find the surface area of the pyramid.
Answers
Answered by
oobleck
so each side of the base has length 4.8/3 = 1.6
The lateral area is 3 triangles, each with base 1.6 and height 8.3
A = 3 * (1.6*8.3)/2 = ____
Sorry, but an equilateral triangle of perimeter 4.8 has an area of
1.6^2/4 * sqrt(3) = 0.55
so how come yours is double that?
The lateral area is 3 triangles, each with base 1.6 and height 8.3
A = 3 * (1.6*8.3)/2 = ____
Sorry, but an equilateral triangle of perimeter 4.8 has an area of
1.6^2/4 * sqrt(3) = 0.55
so how come yours is double that?