1. ©G Dear2008 – Not to be sold/Free to use
Perimeter
Circles, Semicircles
and Quadrants
Stage 4 - Year 9
Press Ctrl-A
©G Dear2008 – Not to be sold/Free to use

2. D = 2r C = π D C = π D = π x 7 ≈ 21.99 cm Circumference Radius 7cm
Diameter
≈ cm
Press

3. Semi-Circle
C = 0.5 x π D
D = 2r
= 0.5 x π x 7
≈ cm
Radius
P ≈
Diameter
7cm
Press ≈

4. C = 0.25 x π x 2 r C = 0.25 x π x D D = 2r = 0.25 x π x 2 x 3.5
Quadrant
C = 0.25 x π x 2 r
C = 0.25 x π x D
D = 2r
= 0.25 x π x 2 x 3.5
≈ cm
3.5cm
Radius
P ≈
≈ cm