Question

What is the lateral area of the rectangular prism? Round the answer to the nearest whole number. Assume 5 m*7 m rectangles on the left and right are the bases. The diagram is not drawn to scale.

Answer 1

For any rectangular prism, with sides of base a,b , and height c.
Then
lateral area = 2c(a+b) (=sum of four rectangles that contain the height c).
For this problem, the base is 5\(\times\)7,
so a=5, b=7, c=16.
Plug in above formula for lateral area.

Answer 2

384

Answer 3

is that it?

Answer 4

384 is correct, that's it. But try to remember the formula for other problems!
:)