1. Learning Objective: I can calculate the circumference of a circle (Level 6)
Green Questions
1. Measure the radius and diameter of the below circles
r =
d =
r =
d =
r =
d =
r =
d =
2. A circle has a radius of 10cm. Which of the following is the correct
way, using a calculator, to find its circumference 10 x π = 10 x 2 x π = 5 x 2 x π = 3. a b c d e
15mm
16mm
17mm
18mm
19mm
What is the circumference of ring B?
What is the circumference of ring D?
If your finger had a circumference of 51mm which ring should you buy?
If your finger had a circumference of 59mm which ring should you buy?

2. 2. The diameter of King Arthur’s Round Table is 5.5 m.
Learning Objective: I can calculate the circumference of a circle (Level 6)
Amber Questions
Dave has a Unicycle; the wheel has a diameter of 60cm. After one rotation of the wheel, how far has he travelled?
2. The diameter of King Arthur’s Round Table is 5.5 m.
A book claims that 50 people sat round the table.
Assume each person needs 45 cm round the
circumference of the table.
Is it possible for 50 people to sit around it?
3. A circular lake is 100 m all the way around
If you swum from one side of the lake to the other
exactly across the middle – how far would you swim?
4. A church door is in the shape of a rectangle with a semi-circular arch. The rectangular part is 2m high and the door is 90cm wide. What is the distance around the whole door? 2m
90cm
5. A barrel is rolled down a hill. If the
barrel has a diameter of 50cm and the hill
is 30m in length – how many times will the
barrel roll completely

3. Learning Objective: I can calculate the circumference of a circle (Level 6)
Red Questions
Question 1
Perimeter: ______
Perimeter: ______
Perimeter: ______
The quarter, semi and three-quarter circles above all have a
radius of 10cm. Work out the perimeter of each shape
Question 2
This shaded shape is made using two semicircles.
One semicircle has a diameter of 20cm.
The other has a diameter of 30cm.
What is the perimeter of the shaded shape?
Question 3
20cm
3. Above is a 2D net of the 3D cylinder. The cylinder is 20cm high and
The radius of its circular face is 3cm. What is the total perimeter of the whole net?
(Clue: The total perimeter involves both circles and the rectangular section)