Question

the perimeter of the base of square pyramid is 40 cm and the total length of its edges is 92 CM calculate its surface area​

Answer 1

The surface area of the perimeter is 340 sq.cm

Step-by-step explanation:

Base length = 40/4 = 10

Base area = 10 x 10 = 100  

Base perimeter = 50

Total length of other 4 edges = 92- 40 = 52

Length of one edge (other than base edge) = 52/4 = 13

Area of 1 face of triangle = 1/2 bh

h = Square root of 13sq - 5 sq = 12  

Area of 1 face of isosceles triangle = 1/2 x 10 x 12 = 60

Area of four faces = 240 sq. cm

Total surface area = 100 +240 = 340 sq.cm

Thus the surface area of the perimeter is 340 sq.cm

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