Question

Rectangular pyramid B is the image of rectangular pyramid A after

dilation by a scale factor of 3. If the surface area of rectangular
pyramid A is 87 cm², find the surface area of rectangular pyramid B,
the image.

Answer 1

Answer: 261 cm²

Step-by-step explanation: 87 x 3 = 261

Answer 2

• 783 cm²

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The area is the function of two dimensions.

The scale factor is 3. It means each dimension is 3 times greater.

Therefore the surface area is 3*3 = 9 times greater:

• S(B) = 9*S(A) = 9*87 = 783 cm²