Rectangle Area Problem: Finding BC When AB = 5cm and Area = 30cm²

Question

Below is the rectangle ABCD, which has an area of 30 cm².

Side AB is equal to 5 cm.
What is the length of side BC?

00:00 Determine the length of the side BC

00:03 Apply the formula for calculating the area of a rectangle

00:07 Side(AB) x by side (BC)

00:11 Mark side BC as X

00:15 Substitute the relevant values into the formula and proceed to solve for X

00:23 This is the solution

First, we will multiply side AB by side BC.

We know that side BC equals 5, therefore:

$AB\times BC=AB\times5$

We will label side AB as $x$ .

Therefore:

$5x=30$

Next, we will divide both sides by 5 to obtain the following:

$x=6$

Therefore:
$BC=6$

6 cm