Calculate examples of the area of a rectangle whose length is 15 cm and it is 5 times its width.

First, let’s find the length of the rectangle, it is 5 times the width, which is 15 cm.

a = 15 cm * 5 = 125 cm.

Find the area of the rectangle. We multiply the length by the width.

S = 125 cm * 15 cm = 1875 cm².

Find the perimeter of the rectangle. Multiply by 2 the sum of the length and width of the rectangle.

P = (125 cm + 15 cm) * 2 = 280 cm.

Answer: the area of the rectangle is 1875 cm², the perimeter is 280 cm.