Question

the total surface area of a cuboid is 40 minutes k a n d is lateral surface area is 26 metres square find the area of floor

Answer 1

T.S.A. of cuboid= 2(lb+bh+hl)= 40m2
=lb+bh+hl=40m2 /2 = 20m2
=lb+bh+lh=20m2----------(1)
=C.S.A. of cuboid= 2(l+b)h = 26m2 
=(l+b)h = 26m2 / 2 = 13m2
=lh+bh= 13m2--------------(2)
from(1) & (2)
=lb+13m2 = 20m2
=lb=20m2-13m2 = 7m2