Question

The perimeter and the area of a rectangle have the same numerical value.

Answer 1

Formula

2*(L + W) = L * W

Given

W = 3

Solution

2*(L + 3) = 3*L

2L+ 6 = 3L                      Subtract 2L from both sides

2L - 2L + 6 = 3L - 2L      combine

6 = L

Answer: The length is 6 units long.