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

  1. 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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4 Questions

Q1.
Find the area of the circle in terms of π.
An image in a quiz
A
B
Correct answer: C
D
Q2.
Find the area of the circle to three significant figures.
An image in a quiz
A
Correct answer: B
C
D
Q3.
Find the area of the circle to 3 significant figures.
An image in a quiz
A
B
Correct answer: C
D
Q4.
Find the area in terms of π.
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A
Correct answer: B
C

4 Questions

Q1.
What is missing from this rearranged formula?
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a) They forgot to square the fraction
b) The fraction should be A over π
c) hey haven’t square rooted the fraction
Correct answer: d) Both b) and c)
Q2.
What will this formula find?
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The area of a circle
The circumference of a circle
Correct answer: The diameter of a circle
The radius of a circle
Q3.
Find the radius of this circle to three significant figures.
An image in a quiz
A
B
C
Correct answer: D
Q4.
The area of a circle is 20 cm squared. What is the diameter to 3 significant figures?
An image in a quiz
Correct answer: A
B
C
D

Lesson appears in

UnitMaths / Circles