Question

Please find entire surface are of a stereo receiver (question 17)

Answer 1

We could approach the stereo receiver to a rectangular prism, that has the formula of surface area (A):

$A=2ab+2bc+2ac$

As the dimensions are given: a = 18", b = 16", c = 9"; then we just have to replace these values in the formula:

$A=2(18)(16)+2(16)(9)+2(18)(9)$

Simplifying:

$A=576+288+324$

$A=1188$

Answer: 1188 in²