The amount of the wrapping paper she used will be 942 square feet.
A closed solid with two parallel rectangular bases joined by a rectangle surface is known as a rectangular prism.
Piper wraps a gift box in the shape of a right rectangular prism.
The dimension of the right rectangular prism will be 15 ft by 14 ft by 9 ft.
Then the surface area will be
Surface area = 2(15 x 14 + 14 x 9 + 9 x 15)
Surface area = 2(210 + 126 + 135)
Surface area = 2 x 471
Surface area = 942 square ft
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