The width of the rectangle is 1/5 dm, and the length is 2/5 dm greater than the width.

| September 5, 2021 | education

The width of the rectangle is 1/5 dm, and the length is 2/5 dm greater than the width. Find the perimeter of this rectangle Find the value of the expression a * 2 for a = 3 / 7.1 / 5 * b for b = 4

1) The perimeter of a rectangle is the sum of the lengths of all its sides. Since in a rectangle the opposite sides are equal, then P = 2 * (a + b), where a is the length, b is the width. We calculate what the length of the rectangle is, knowing that it is 2/5 dm = 0.4 dm greater than the width, equal to 1/5 dm = 0.2 dm.

a = 0.2 + 0.4 = 0.6 decimeters.

Let’s calculate the perimeter of the rectangle.

P = 2 * (0.6 + 0.2) = 2 * 0.8 = 1.6 decimeters.

Answer: 1.6 decimeters.

2) a * 2, if a = 3/7, then 3/7 * 2 = 3 * 2/7 = 6/7.

3) 1/5 * b, if b = 4, then 1/5 * 4 = 4/5.



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