Question
A square whose diagonal is 12√ 2cm is made base of the
pyramid. if height of the pyramid is 15cm, then what is the total surface area of the pyramid.(cm 2)Solution
Diagonal of square =a√ 2 = 12 √ 2cm a=12cm           For square base of pyramid – 
now total surface area of pyramid =Area of base +1/2 ×perimeter of base ×slant height = (12)2+(4×12)/2 x3√29 =144+72√29 =72(2+√29) cm2
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