lateral phase of square pyramid are equilateral triangle and the length of base edge is 30cm what is it surface area
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Area of 1 equilateral triangle = by herons formula
square root of
s(s-a)(s-b)(s-c)
semi perimeter (s) =( 30+30+30) /2= 90/2 = 45 cm
Area = square root of 45(45-30)(45-30)(45-30)= square root of 675× 15×15=square root of 151875 =389.71 approx
LSA = 4×389.7sq.cm = 1558.8 sq.cm approx
square root of
s(s-a)(s-b)(s-c)
semi perimeter (s) =( 30+30+30) /2= 90/2 = 45 cm
Area = square root of 45(45-30)(45-30)(45-30)= square root of 675× 15×15=square root of 151875 =389.71 approx
LSA = 4×389.7sq.cm = 1558.8 sq.cm approx
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