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Every rectangle here has a perimeter of 20 cm. Which one has the greatest area?

A5 cm by 5 cm
B6 cm by 4 cm
C8 cm by 2 cm
D9 cm by 1 cm
Answer & Solution
Correct answer: A. 5 cm by 5 cm
The areas are 25, 24, 16 and 9 sq cm, so the 5 by 5 square is greatest.
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