Circumference of a circle
Identify the radius and diameter
for each of the circles.
6 cm
48 cm
emerepitr
14.5 cm
5.6 cm
45cm
Literacy
A partial eclipse occurred when Paul was writing
out his key words. He couldn’t see because of the
darkness and the words got mixed up. Can you
decipher what the key words are meant to be?
fucerecnicemur
Skill 1
14 cm
Find the circumference of these circles
20 cm
17 cm
To find the circumference of a circle
use the formula
Memory
ROK – Retention of Knowledge
Circumference = 𝜋d
Pi is the number of times the diameter fits into
the circumference of a circle. Use pi as
𝜋 = 3.14 … …
Example: Radius = 7.5cm
Diameter = 15cm
15 cm
C𝑖𝑟𝑐𝑢𝑚𝑓𝑒𝑟𝑒𝑛𝑐𝑒 = 𝜋𝑑
C𝑖𝑟𝑐𝑢𝑚𝑓𝑒𝑟𝑒𝑛𝑐𝑒 = 3.14 × 𝑑𝑖𝑎𝑚𝑡𝑒𝑟
C𝑖𝑟𝑐𝑢𝑚𝑓𝑒𝑟𝑒𝑛𝑐𝑒 = 3.14 ×15
C𝑖𝑟𝑐𝑢𝑚𝑓𝑒𝑟𝑒𝑛𝑐𝑒 = 47.1𝑐𝑚
Skill 2
Find the missing length
Circumference= 37.68𝑐𝑚
Stretch
www.missbsresources.com
Find the circumference of
these sectors
𝑥
6 cm
4 cm
12 cm
32 cm
Circumference= 7.85 𝑐𝑚
11 cm
𝑥
Find the perimeter of the stadium.
Circumference = 39.25𝑐𝑚
8.4 cm
25.2 cm
𝑥
11 cm
3.9 cm
13 cm