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

3 ft by 7 ft

Step-by-step 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.