10. 3D Measurement

Lesson

Let's review how to find the area of a rectangle to help us in this lesson.

Find the area of the rectangle shown.

Worked Solution

Idea summary

When we calculate area, the unit of measurement is squared. If we have sides measured in centimetres \text{(cm)}, for example, the area will be \text{cm}^2.

Let's look at how we can use unit cubes to find the volume of an object.

In this figure, 1\text{ block}=1\text{ cm}^3. What is the volume of the solid figure?

Worked Solution

Idea summary

Volume means the amount of space a 3D shape takes up.

Let's see how to calculate the volume of rectangular prisms in this video.

Find the volume of the rectangular prism shown.

Worked Solution

Idea summary

When we find the volume of a rectangular prism, we need to multiply together three measurements:

length (l)

width (w)

breadth (b)

Sometimes we refer to these measurements as length, width and height.