Asked by Ruaidhri
What is the slant height of a right pyramid with a surface area of 65.5 meters squared and a base perimeter of 14 metres?
Answers
Answered by
Steve
If the pyramid has n sides of length s, then there are n triangles, each with area 1/2*s*h
A = n * 1/2 * s * h
Now, n*s = p
Hence the formula A = ph/2
So, 65.5 = 7h
h = 9.36
Sure it wasn't 66.5? That would give a nice h=9.5
A = n * 1/2 * s * h
Now, n*s = p
Hence the formula A = ph/2
So, 65.5 = 7h
h = 9.36
Sure it wasn't 66.5? That would give a nice h=9.5
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