The length of the rectangle is one decimeter and two centimeters, and it is 4 cm longer than its width.

The length of the rectangle is one decimeter and two centimeters, and it is 4 cm longer than its width. Calculate the perimeter and area of the rectangle.

The formula for finding the area of a rectangle:
S = a * b, where a is the width, b is the length of the rectangle.
Formula for finding the perimeter of a rectangle:
P = 2 * (a + b).
1) Let’s express the length of the rectangle in cm:
1 dm 2 cm = 12 cm.
2) Determine the width of the rectangle:
12 – 4 = 8 (cm) – the width of the rectangle.
3) Find its area:
12 * 8 = 96 (cm ^ 2) – the area of the rectangle.
4) Find its perimeter:
2 * (12 + 8) = 2 * 20 = 40 (cm) – the perimeter of the rectangle.
Answer: the perimeter is 40 cm, the area is 96 cm ^ 2.