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If a rectangular swimming pool has a perimeter of 132 feet and is 21 feet wide, what is its area?

A 945 square feet
Explaination
The formula for the area of a rectangle is: Area = length × width = L × W We know the width of the pool, but not it's length. However, we also know the perimeter, which is the distance around a shape. For a rectangle, the perimeter is: Perimeter = 2L + 2W From this formula and the given values for width and perimeter, we may solve for L, and the Area of the pool afterwards. So for a rectangle with P = 132 feet and W = 21 feet, L will be: 132 = 2L + 2 × 21 132 = 2L + 42 132 - 42 = 2L 90 = 2L L = 45 Now that we know the length, we may proceed solving for the area of the pool: Area = 45 × 21 = 945 square feet
B 1890 square feet
C 2772 square feet
D 111 square feet