Question

the surface area of cube = 252 square cm.It lenght and breadth are 8cm ,7cm respectively. Find height ​

Answer 1

Answer:

height = 4.66 cm

Step-by-step explanation:

I think you meant the surface area of a CUBOID is 252 cm^2 since for a cube, length = breadth = height = side of the cube.

Given :

T. S. A. = 252 cm^2

Length = 8 cm

Breadth = 7 cm

T. S. A. of a cuboid = 2( lb + lh + bh)

ATQ;

2( 56 + 8h + 7h) = 252

=> 56 + 8h + 7h = 126

=> 15h = 70

=> h = 4.66

Therefore,

height of the cuboid = 4.66 cm

Answer 2

Answer:

6cm

Step-by-step explanation:

since, area of cuboid = 2[LB+BH+LH]

⇒252=2[8*7 + 7*H + 8*H]

⇒252/2= 56 + 7H +8H

⇒126-56=15H

⇒70/15=H

⇒4.66cm=H