Question

the surface area of cuboid is 758 cm square. its length and breadth are 14 cm and 11 cm respectively. find its height.

Answer 1

Surface Area of cuboid =2(lb+bh+hl)

Surface Area of cuboid = 758 sq. cm ( given )
length = 14 cm 
breadth = 11 cm 
height = ? cm 

ATQ 

2(lb+bh+hl) = 758

lb + bh + hl = 758/2

lb + bh + hl = 379

14 x 11 + 11h + 14 h = 379

154 + 25h = 379 

25 h = 379 - 154
 
25h = 225

h = 225/25 

h = 45/5

h = 9 cms.

Answer 2

surface area of cuboid = 758

surface area of cuboid = 2 ( lh + bh + lb )

l = 14, b = 11

h =?

2 ( 14×h+11×h + 11 × 14)=758

2 ( 11 h+14h+154)=758

25h+154=758/2

25h=379-154

h=225/25

h=9 cm