Calculate Rectangle Side Length: Given Area 42 cm² and Height 12 cm

Question

Below is the rectangle ABCD.

It has an area of 42 cm² and side AD is equal to 12 cm.

What is the length of side DC?

00:00 Determine the value of side DC

00:03 Apply the formula for calculating the area of a rectangle (side x side)

00:09 Substitute in the relevant values according to the given data and proceed to solve for DC

00:12 Isolate DC

00:16 This is the solution

Remember that to calculate the area of the rectangle, we multiply the length by the width.

Therefore:

$42=12\times CD$

$42=12CD$

Divide both sides by 12:

$3.5=CD$

3.5