Question

Find the height of a rectangular prism if the surface area is 148 cm. sq. The width is 4 cm & the length is 5 cm.
A)6
B)12
C)7.4
D)14.8

Answer 1

A) 6.

Answer 2

@rajathsbhat how did you get that ?

Answer 3

take the height as x.

Answer 4

Area of the bottom+top=20+20=40sq cm

Answer 5

4x+4x=8x

Answer 6

5x +5x=10x

Answer 7

\[\large \text{surface area} = lw + lh + wh\]

where l = length
w = width
h = height

Answer 8

Total area=8x+10x+40=148
18x=108
x=6

Answer 9

cm

Answer 10

@rajathsbhat ok got it. thanks !

Answer 11

yw :)

Answer 12

wait...i think i wrote the formula wrong \[\large \text{surface area} = 2(length \times width) + 2(width \times height) + 2(length \times height)\]

sorry for that lol