A square pyramid has a base side length of 20.4 cm and a height of 18.2 cm. Which square pyramid is similar?

Similar pyramids have the same ratio of base side length to height. The original ratio is 20.4 ÷ 18.2, which is about 1.121. Choice C has a ratio of 30.6 ÷ 27.3, also about 1.121; both measurements are 1.5 times the original. So the pyramid in choice C is similar.

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