Question

The area of a rectangle is 42 square inches

and one side is 12 inches long. Find the perimeter of the rectangle. ​

Answer 1

The perimeter is 31 inches

Explanation:

The perimeter is the sum of all the sides.

The formula for the area of the rectangle is :
`length*width`

To work this out you would first need to divide the area of 42 by the length of 12, this gives you 3.5. This is because the formula for the area of a rectangle is length multiplied by the width, and so by dividing the area by 12 we are working out the perimeter of the missing side.

Now that we know the lengths of both sides we can begin working out the perimeter. You can do this by multiplying the lengths by 2. Multiply 12 by 2,which gives you 24. Multiply 3.5 by 2, which gives you 7.

The final step in calculating the perimeter would be to add the values of 24 and 7, this gives you 31. This is because the perimeter is sum of all of the lengths of a shape.

1) Divide 42 by 12.

`42/12=3.5`

2) Multiply 12 by 2.

`12*2=24`

3) Multiply 3.5 by 2.

`3.5*2=7`

4) Add 7 and 24.

`24+7=31`