Checking and securing understanding of perimeter for compound shapes | Maths

Starter quiz

The __________ is the distance around a 2D shape.

area

perimeter ✓

volume
The perimeter of this rectangle is ______ cm.

'14' ✓
The perimeter of this parallelogram is ______ cm.

'16.6' ✓
The perimeter of this triangle is ______ cm.

'45' ✓
Which of these shapes has different perimeter to the other three shapes?
The length of the edge marked 'a' is ______ cm.

'1.5' ✓

Which of the following are examples of compound shapes?
The perimeter of this compound shape is ______ cm.

'33' ✓
The perimeter of this compound shape is ______ cm.

'28' ✓
The perimeter of this compound shape is ______ cm.

'64.4' ✓
Match the marked edges with the correct calculations.

$a$

⇔

$4 + c$ ✓

$b$

⇔

$8 − 3$ ✓

$c$

⇔

$\sqrt{5^2-3^2}$ ✓

$d$

⇔

$\sqrt{\text{b}^2+12^2}$ ✓
The perimeter of this compound shape is ______ cm.

'56' ✓

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Before calculating perimeter, consider the shape and check you know the required lengths.
It is not necessary to know every side length.
Sometimes you can deduce the sum of a subset of side lengths.
Identifying where you can be more efficient can make calculations simpler.

Pupils may miss an edge when calculating the perimeter.

Encourage the pupils to trace the perimeter to check that all edges have been included in the sum.

Perimeter - The perimeter is the distance around a 2D shape.
Compound shapes - A compound shape is a shape created using two or more basic shapes.
Composite shapes - A composite shape is an alternative for a compound shape.