# Calculate the area of non-rectilinear shapes

## Lesson details

### Key learning points

1. In this lesson, we will estimate the area of shapes that are not rectangles and are presented on a grid. Then we will use a mixture of calculating the area of rectangles and counting the additional parts to estimate the total area.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

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## Worksheet

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## Starter quiz

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### 4 Questions

Q1.
Choose a formula that could be used to calculate the area of a rectangle.
2 (a + b)
a + a + b + b
a² + b²
Q2.
Choose a formula that could be used to calculate the area of a square.
a x 4
a² x b²
Q3.
Choose a formula that could be used to calculate the perimeter of a rectangle.
Correct answer: 2 (a + b)
a + b
a x 4
Q4.
Choose a formula to calculate the perimeter of a regular hexagon.
5a
7a

## Exit quiz

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### 6 Questions

Q1.
What is the area of the shape below?
16 cm²
8 cm²
Q2.
What is the perimeter of the shape below?
16 cm²
8 cm
Q3.
What is the perimeter of the shape below?
28 cm²
49 cm
Q4.
What is the area of the shape below?
28 cm
49 cm
Q5.
What is the area of the shape below?
21 cm²
24 cm²
27 cm²