The width of the rectangle is half its length. Calculate the perimeter of the rectangle if its length is 48 mm.

From the condition, we know that the width of the rectangle is half its length. And the length of the rectangle is 48 mm.

Let’s find the width of the rectangle.

Since the width is two times less than the length, we must divide the length by 2 and get the value of the width of the rectangle.

48mm: 2 = 24mm rectangle width.

Let’s remember the formula for finding the perimeter of a rectangle. Perimeter is the sum of the lengths of all sides of the rectangle:

P = 2 (a + b);

Substitute and calculate:

P = 2 (24 + 48) = 2 * 72 = 144 mm.

Answer: 144mm perimeter of the rectangle