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 Find side DC

00:03 We'll use the formula for calculating rectangle area (side times side)

00:09 We'll substitute appropriate values according to the given data and solve for DC

00:12 We'll isolate DC

00:16 And this is the solution to the problem

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