Foundation

# Find the radius and diameter when given the area

Foundation

# Find the radius and diameter when given the area

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## Lesson details

### Key learning points

- In this lesson, we will learn how to find the radius or diameter of a circle when given the area. This lesson will involve rearranging the formula for the area of a circle.

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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.

Find the area of the circle in terms of π.

A

B

D

Q2.

Find the area of the circle to three significant figures.

A

C

D

Q3.

Find the area of the circle to 3 significant figures.

A

B

D

Q4.

Find the area in terms of π.

A

C

### 4 Questions

Q1.

What is missing from this rearranged formula?

a) They forgot to square the fraction

b) The fraction should be A over π

c) hey haven’t square rooted the fraction

Q2.

What will this formula find?

The area of a circle

The circumference of a circle

The radius of a circle

Q3.

Find the radius of this circle to three significant figures.

A

B

C

Q4.

The area of a circle is 20 cm squared. What is the diameter to 3 significant figures?

B

C

D