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A regular square pyramid is placed in a ...

A regular square pyramid is placed in a cube so that the base of the pyramid and that of the cube coincide. The vertex of the pyramid lies on the face of the cube opposite to the base, as shown. An edge of the cube is 7 inches.

How many square inches (approximately) are in the posi- tive difference between the surface area of the cube and the surface area of the pyramid ?

A

134.4

B

133.4

C

138.4

D

135.4

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The correct Answer is:
D
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