Question

Find the lateral surface area and total surface area of a cuboid which is $8$m long, $5$ m broad and $3.5$ m high.

Answer 1

We are given $l=8m,b=5m,h=3.5m.$ We know that
L.S.A. $=2h(l+b)=2\times 3.5(8+6)=7\times 14=98m^2$
Similarly,
T.S.A. $=2(lb+bh+lh)=2(8\times 6+6\times 3.5+8\times 3.5)=2(48+21+28)=2\times \left(97\right)=194m^2$