Volume of composite solids
I can calculate the volume of a composite solid.
Volume of composite solids
I can calculate the volume of a composite solid.
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Lesson details
Key learning points
- A composite solid can be decomposed to make the volume easier to calculate.
- Completing the solid may be a more useful method.
- Decomposing and rearranging parts of the solid may be beneficial.
Keywords
Volume - The volume is the amount of space occupied by a closed 3D shape.
Compound shape - A compound shape is a shape created using two or more basic shapes. A composite shape is an alternative for compound shape.
Common misconception
Pupils may only using given measures in their calculations, even when these are not the lengths required for substitution into a volume formula.
Encourage pupils to annotate diagrams to show how the are breaking down a compound/composite shape. Pupils should label the diagram with any new lengths needed. They may need to use Pythagoras or trigonometry to find these new lengths.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.A shape created using two or more basic shapes is called a shape.
Q2.This composite solid is constructed from two cuboids. All lengths given are in centimetres. Calculate the total surface area of the solid.
Q3.This composite solid is constructed from two congruent cuboids. All lengths given are in centimetres. The total surface area of the solid is cm².
Q4.The composite solid is constructed by placing a hemisphere with diameter 8 cm on top of a cuboid. Find the surface area of the solid.
Q5.The composite solid is constructed with a cylinder and a hemisphere. Each have a diameter of 12 cm. Find the surface area of the solid.
Q6.The composite solid is constructed with a cone and a hemisphere. The surface area, in terms of 𝜋, is 𝜋 cm².
Assessment exit quiz
6 Questions
Q1.The amount of space occupied by a closed 3D shape is called the of the shape.
Q2.The diagram shows a composite solid constructed from two congruent cuboids. All lengths given are in centimetres. Which of these calculations give the total volume of the solid?
Q3.This composite solid is constructed from two cuboids. All lengths given are in metres. The total volume of the solid is m³.
Q4.This composite solid is constructed by placing a hemisphere with diameter 12 cm on top of a cuboid. Find the volume of the solid. Give your answer to the nearest cubic centimetre.
Q5.This composite solid is constructed with a cylinder and a hemisphere. Each have a diameter of 8 cm. The volume of the solid is cm³ (correct to 3 significant figures).
Q6.This composite solid is constructed with a cone and a hemisphere. The volume of the solid, in terms of 𝜋, is 𝜋 cm³.
