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StellarStephanie
Lets find the area of the 2 rectangles on the left and right side.
8*7 (2) = 112 (Both rectangles in total)
Now lets find the rectangles on the front and back.
13*7 (2) = 182
Now, the top and bottom ones.
13*8 (2) = 208
Add them all together.
112+182+208 = 502
The surface area is 502.
vinyl50098
Wee you find the area off all the sides and add em all up. First, for the big side to find the area is lw so 13 * 7= 91mm and there are 4 of those sides so 91*4 = 364mm. Next, for the small sides, lw is 8*7=56 and there are 2 so 50*2 = 112mm. And finally you add them together 112+364= 476mm

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