©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

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

Semi-Circle C = 0.5 x π D D = 2r = 0.5 x π x 7 ≈ 10.997 cm Radius P ≈ 7 + 10.997 Diameter 7cm Press ≈ 17.997

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 ≈ 5.499 cm 3.5cm Radius P ≈ 3.5 + 3.5 + 5.499 ≈ 12.499 cm