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A rectangular gift box measures 8 inches by 10 inches by 3 inches. what is the surface area?
A=184 square inches
B=214 square inches
C=240 square inches
D=268 square inches

Sagot :

8 x 10 = 80 inches squared (one side)
3 x 8 = 24 inches squared (one side)
3 x 10 = 30 inches squared (one side)
80 + 24 + 30 = 134 inches squared (three sides)
Double that for all 6 sides. 2 x 134 = 268 square inches.
The answer is D.
iGreen
SA = 2(wl+hl+hw)

SA = 2((3)(10)+(8)(10)+(8)(3))

Multiply:

SA = 2(30 + 80 + 24)

Add:

SA = 2(134)

Multiply:

SA = 268
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