# How Do You Find The Surface Area Of A Rectangular Based Pyramid ?

## 3 Answers

JJJJJJ BBBBBB answered
Consider that the pyramid has 4 triangular sides and one rectangular (not square) side. Call the height of the pyramid "H", the length of the rectangle "L" and the width "W".

Area = L*W + (L*H) + (W*H)

Normally a triangle's area is (W*H)/2, but since we have a rectangle for a base we have to compute the area of two pairs of equal triangles.
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Nathan Wendland answered
Area=length times width + length times width + width times height
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Anonymous answered
Does it have isosceles triangle faces?
If so, then let's say that the two sides of the rectangle measure 8 ft and 6 ft, and the height of the triangle measures 6 ft.
This is the formula:
SA = Area of Base + 2(1/2 x base x height) + 2(1/2 base x height)
SA = (8 x 6) + 2(1/2 x 8 x 6) + 2(1/2 x 6 x 6)
SA = 48 + 2(1/2 x 48) + 2(1/2 x 36)
SA = 48 + 2(24) + 2(18)
SA = 48 + 48 + 36
SA = 132
There you go. ;-P
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