The length of the rectangle is 9 dm and the width is 7 cm. It is necessary to find its area and perimeter.

Let’s start by recalling the perimeter and area formula for a rectangle:
P = 2 (a + b);
S = a • b;
We are given: a = 9 dm., B = 7 cm.
Let’s convert decimeters to centimeters. One has decimeters 10 centimeters.
We get:
9 • 10 = 90 cm.,
Find the perimeter:
P = 2 (90 + 7) = 2 * 97 = 194 (see);
Find the area:
S = 90 • 7 = 630 (cm ^ 2).
Answer: P = 194 cm, S = 630 cm ^ 2.