1

Problem

Find the length of the rectangle whose area is \$45 cm^2\$ and width is 5 cm.

2

Step

Given the area of rectangle and width is

\$45 cm^2\$ and 5 cm

3

Formula

The formula for calculating the area of a rectangle is: \$"Area" (a) = "Length(l)" \times "width(w)"\$

4

Step

We can rearrange the formula to solve for the length:

\$"Length" = "(Area)" / "(Width)"\$

5

Step

To find the value of l, substitute the given values into the formula:

\$l = (45)/5\$

l = 9

6

Solution

So, the length of the rectangle is 9 cm.

7

Sumup

Please summarize steps

Choices

8

Choice-A

This is incorrect because the length is 9cm, not 90m. Additionally, the units are inconsistent (meters vs. centimeters).

Wrong 90m

9

Choice-B

This is correct. The length of the rectangle is 9cm.

Correct 9 cm

10

Choice-C

This is incorrect because the length is 9cm, not 9m. The units are inconsistent.

Wrong 9 m

11

Choice-D

This is incorrect because the length is 9cm, not 99cm.

Wrong 99 cm

12

Answer

Option

B

13

Sumup

Please summarize choices