One side of a rectangle is twice the length of the other. The perimeter of the rectangle is 21 cm. Find the length of the shorter side.

Answer 1

We Suppose that,

Length of Rectangle = x

Width of Rectangle = 2x (since its twice)

Then we know by definition: Perimeter = 2 (L + W) => 2 (x + 2x) = 21 cm

solving for unknown length x: we get 6x = 21 => x = 3.5 cm (which is shorter one).