# Calculate the area of non-rectilinear shapes

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## Lesson details

### Key learning points

- 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.

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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.

a + b

a x 4

Q4.

Choose a formula to calculate the perimeter of a regular hexagon.

5a

7a

### 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

45 cm²

Q6.

What is the perimeter of the shape below?

22 cm

28 cm