The length of one side of the rectangle is 17.9 cm and the length of the second side is 6.3 cm

| February 10, 2021 | education

The length of one side of the rectangle is 17.9 cm and the length of the second side is 6.3 cm less than the length of the first side, find the perimeter of the rectangle.

1) Find the length of the second side of the rectangle. Based on the condition of the problem, the second side of the rectangle is less than the first, which means that we are given the length of the rectangle, but we need to find the width.
Let us denote the length of the rectangle by the letter a, and the width by the letter b.
The problem statement says that the width of the rectangle is 6.3 cm less than the length. If we say that one value is “by” several units more or less than another, then we are talking about addition or subtraction. In our case, we are talking about subtraction. Let’s find the width of the rectangle:
b = 17.9 – 6.3 = 11.6 cm.
1) Find the perimeter of the rectangle. The perimeter of a rectangle is the sum of the length and width of the rectangle multiplied by 2. Let’s write the formula for the perimeter of a rectangle:
P = (a + b) × 2,
Substituting the length and width of the rectangle into the formula, we calculate the perimeter:
P = (17.9 + 11.6) × 2 = 29.5 × 2 = 59 cm.
Answer: The perimeter of the rectangle is 59 cm.



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