The length of the rectangle is 21 cm, the width is 1/3 of its length. Find the perimeter of this rectangle.
| November 29, 2020 | education
A = 21 cm, B = 1/3 of A
Decision:
B = 21 * 1 \ 3
B = 21 \ 3 * 1
B = 7 * 1
B = 7
A = 21 cm, B = 7 cm
The perimeter is equal to the sum of all sides, then:
(21 * 2) + (7 * 2) = 42 + 14 = 56 cm
Answer: the perimeter of the rectangle is 56 centimeters
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