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Questions  

The base of right pyramid is a square of side 10 cm. if the height of the pyramid is 12 cm, then its

a
Slant height = 13cm
b
Lateral surface area = 260 cm2
c
Total Surface Area = 360 cm2
d
volume = 400 cm2

detailed solution

Correct option is A

Base of right pyramid is square of side (s) = 10 cm 

Height of pyramid = 12 cm

slant height =h2+r22  = 122+52  = 13 cm L.S.A =12×perimeter of base ×slant height =12×4×10×13               = 260 cm2 TSA = LSA + Area of base = 260+ 102 = 360 cm2 Volume = 13×area of base ×height =13×10×10×12=400 cm2

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