The length of the rectangle is 12cm. The width is 3 times more. Find the perimeter and area of the rectangle.

1. Let’s calculate the length of the second side of the rectangle if we know that it is three times larger than the first side.

12 * 3 = 36 cm.

2. Now, knowing the lengths of both sides of the rectangle, we calculate its area. After all, the area is the product of two dimensions of a rectangle, namely its length and its width.

S = 12 * 36 = 432 cm ^ 2.

3. Next, we calculate the perimeter of a given rectangle by adding the lengths of all its sides.

P = 12 + 12 + 36 + 36 = 96 cm.

Answer: The area of the rectangle is 432 cm ^ 2, the perimeter is 96 cm.