b) The area of the base of a rectangular pyramid is 85 cm". If the area of each
triangular face along the length and breadth is 28,5 cm and 23:2 en respectively,
find the total surface area of the pyramid,
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Step-by-step explanation:
Area of base rectanglar pyramid =85sq.cm
Area of triangular face = 1/2 x breadth x length
=1/2 x 28 x 5
=70sq. cm
there are four triangle
so area of four triangle =4 x 70
280sq. cm
total surface area = (280 + 85) sq.cm
= 365sq .cm
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