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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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