# Revisiting area: Working out side lengths when given area

## Slide deck

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## Lesson details

### Key learning points

1. In this lesson, we will be looking at working out side lengths of various quadrilaterals and triangles when only given the area and 1 other measure of a shape.

### 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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### 5 Questions

Q1.
Which of the following is larger than the area of a circle with a radius of 3cm?
20
27
Correct answer: 30
9
Q2.
Which of the following is larger than the area of a circle with a radius of 2cm?
10
11
12
Correct answer: 13
Q3.
Which of the following is smaller than the area of a circle with a radius of 4cm?
Correct answer: 48
53
60
70
Q4.
True or false: A circle with a radius of 1cm has a larger area than a rectangle with a base of 1cm and a height of 3cm.
False
Correct answer: True
Q5.
True or false: A circle with a radius of 2cm has a larger area than a rectangle with a base of 2cm and a height of 6cm.
False
Correct answer: True

## Exit quiz

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### 5 Questions

Q1.
What is the height of a triangle with an area of 24 and a base of 8?
Correct answer: 6
7
8
9
Q2.
What is the base of a parallelogram with an area of 24 and a height of 3?
6
7
Correct answer: 8
9
Q3.
What is the height of a triangle with an area of 55 and a base of 11?
Correct answer: 10
5
8
9
Q4.
This trapezium has an area of 25. Given that a=6 and b=4. Work out the height of the trapezium.
10
11
Correct answer: 5
8
Q5.
This trapezium has an area of 30. Given that a=7 and h = 4. Work out the length of b.
10
11
5
Correct answer: 8