SSC CGL Model Paper 5

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Question : 69 of 100

Marks: +1, -0

A pyramid has a square base, whose side is 8 cm. If the height of pyramid is 18 cm, then what is the total surface area (in cm

^2

) of the pyramid?

$32(√ 85 + 1)$
$16(√ 85 + 1)$
$32(√ 85 + 2)$
$16(√ 85 + 2)$

Solution:

Slant height =

√{182+4^2}=2√85

Area

=1/2×

(Perimeter of base) × slant height + Area of base

=1/2×32×2√85+64

=32√85+64

=32(√ 85 + 2)

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