Question

Find the total surface area of of a cuboid for the following dimensions:

(i) Length = 30 cm, Breadth = 45 cm and Height = 65 cm
(ii) Length = 2 m 15 cm, Breadth = 1 m 70 cm and Height = 70 cm

Answer 1

(i) Length = 30 cm, Breadth = 45 cm and Height = 65 cm
Total surface area of cuboid =2(lb+bh+lh)
=2(30$\times$45+45$\times$65+30$\times$65)
=2(1350+2925+1950)
=2(6225)
=12450 cm${}^2$
(ii) Length = 2 m 15 cm, Breadth = 1 m 70 cm and Height = 70 cm
Length = 2.15 m, Breadth = 1.70 m and Height = 0.70 m
Total surface area of cuboid =2(lb+bh+lh)
=2(2.15$\times$1.7+1.7$\times$0.7+2.15$\times$0.7)
=2(3.655+1.19+1.505)
=2(6.35)
=12.7 m${}^2$