Lesson #9

Volume of a Rectangular Prism

​Lesson #9

Finding Missing Sides

We will highlight sides that have equal lengths.

Finding Missing Sides

All red lines have length of 6 m.

Multiple Choice

The yellow line has a length of ___.

• 3m

• 4m

• 6m

Multiple Choice

The red line has a length of ___.

• 3m

• 4m

• 6m

Using the AREA formula

A = L x W

What would be the width of the rectangular prism?

Using the AREA formula

20m² = 4m x _m

We know the height of that side is 4m.

​4m

Using the AREA formula

20m² = 4m x 5m

So the width of the prism is 5m.

​4m

​5

Multiple Choice

The area of the shaded side is 12m². What would be the height of the prism?

• 12 m

• 3 m

• 2 m

• 6 m

The volume of the prism is 12m³.

Length = 3m

Width = 2m

What would be the missing height?

V = L x W x H

Using the VOLUME formula

We know:

V = L x W x H

12m³ = 3m x 2m x H

Step 1: Write down what we know.

Using the VOLUME formula

We know:

12m³ = 3m x 2m x H

12m³ = 6 x H

So, H = 2m

Step 2: Simplify and Solve.

Using the VOLUME formula

Multiple Choice

The VOLUME of the prism is 80m³. What is the missing HEIGHT?

• 10m

• 8m

• 5m

• 40m

If we have time, play mini-quiziz