Question

The surface area of a cuboid is 4150 cm2 . If it's lengthe and breadth are 35 cm and 25 cm respectively, find its height.

Answer 1

TSA = 2(l+b)h + lb

Substituting we get;

4150 = 2(35+25)h + 35*25

4150 = 2(70)h + 875

4150 - 875 =140h

3275= 140 h.

Height = 23.39 CM.

Answer 2

ANSWER-

let height of the cuboid be h,

surface area of cuboid= 2x(lb+bh+hl)

                             4150 => 2x(35 x 25 +25 x h + h x 35)

                             4150 => 2x(875 + 25h+ 35h)

                         4150÷2 => 875+60h

                             2075 => 875+60h

                   2075 - 875 => 60h

                             1200 => 60h

                      1200÷60 => h

                                   h => 20cm

                                                  thus, height of cuboid is 20 cm.