Posted by **mary** on Monday, April 18, 2011 at 9:34am.

Find the surface area of a rectangular prism with a length of 8 inches, a width of 5 inches and a height of 2 inches.

so far this is what I have-

(2(8)+2(5))2=72 + 2(8.5)=80

my answer is 152in^2

the books answer is 132in^2

What did I do wrong???? Thanks for the help!

- geometry -
**Jai**, Monday, April 18, 2011 at 9:54am
recall that surface area of rectangular prism is given by

SA = 2*(LW + LH + WH)

where

L = length

W = width

H = height

substituting,

SA = 2*[(8)(5) + (8)(2) + (5)(2)]

SA = 2*(40 + 16 + 10)

SA = 2*(66)

SA = 132 in^2

hope this helps~ :)

- geometry -
**mary**, Monday, April 18, 2011 at 10:05am
Thank you so much Jai-that really cleared thing up

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