Lesson details

Key learning points

  1. In this lesson, we will learn to calculate the area of a circle using a radius or diameter. We will also learn how to work backwards from the area of a circle to determine the radius and diameter.

Licence

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5 Questions

Q1.
Pi is approximately...
1.41
2.71
Correct answer: 3.14
4.59
Q2.
If a circle has radius 5, then the circumference is approximately...
15.7
16.2
27.1
Correct answer: 31.4
Q3.
Find the perimeter of a.
15+2.5pi
15+5pi
Correct answer: 20 + 2.5pi
20+5pi
Q4.
Find the perimeter of b.
Correct answer: 36 + 10pi
36+20pi
36+5pi
56 + 20pi
56+10pi
Q5.
Find the perimeter of c.
Correct answer: 36pi + 24
36pi + 48
72pi + 24
72pi + 48

5 Questions

Q1.
What is the area of circle a?
14pi
Correct answer: 49pi
7pi
Q2.
What is the area of circle b?
Correct answer: 1 pi
2 pi
4 pi
Q3.
What is the area of circle c?
10 pi
100 pi
Correct answer: 25 pi
5 pi
Q4.
What is the area of a circle with radius of 12?
12 pi
Correct answer: 144pi
24pi
36pi
Q5.
What is the area of a circle with a diameter of 6?
144 pi
36 pi
6 pi
Correct answer: 9 pi

Lesson appears in

UnitMaths / Circles