Question

A rectangular fish pond is 21 ft2 in area. If the owner can surround the pond with a 20-foot fence, what are the dimensions of the pond?

3.5 ft by 6 ft



4 ft by 6 ft



3 ft by 7 ft



3.5 ft by 7 ft

Answer 1

3 ft by 7 ft

Explanation:

Try the solutions and find the one that works.

3.5 × 6 — area OK, perimeter = 19 ft

4 × 6 — area = 24 ft², perimeter OK

3 × 7 — area OK, perimeter OK

3.5 × 7 — area 24.5 ft², perimeter 21 ft

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The perimeter is the sum of the four side lengths; the area is the product of two adjacent side lengths.