Question

Total surface area of a cuboid is 400cm. Height of the cuboid is 20cm. Find the perimeter of the base of the cuboid.
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Answer 1

l=?
b=?
h=20cm

A/Q,

TSA of a cuboid = 400 cm
=) 2(lb+bh+hl)= 400 cm
=) 2(lb+b*20+20*l)= 400 cm
=) 2(lb+20b+20l)= 400 cm
=) 2*lb+40bl= 400
=) 80bl= 400
=) bl = 400/80
=) bl= 5 cm

Therefore, Perimeter of the base of the cuboid =2(l+b)
=2(lb)
=2*5
=10 cm


HOPE I HELP YOU!!