1 Press Ctrl-A ©G Dear 2010 – Not to be sold/Free to use Perimeter of Composite Figures Stage 6 - Year 11 Applied Mathematic (Preliminary General 1)

2 Composite Rectangles Find the missing values. 8 m8 m 6 m6 m 4 m4 m 4ma b b c a = 4m, b = (8 – 4) ÷ 2 = 2. c = 6m, 4 m4 m 2 m2 m2 m2 m 6 m6 m

3 Composite Rectangles Find the missing values. 8 m8 m 6 m6 m 4 m4 m 4m 4 m4 m 2 m2 m2 m2 m 6 m6 m End of Slide Do Questions 1 a = 4m, b = (8 – 4) ÷ 2 = 2. c = 6m, Perimeter = 4m +6m +2m +4m + 8m +4m +2m +6m = 36 m

4 5cm Triangles and Rectangles Press 12 cm End of Slide h= 4cm 6 cm 6 + Perimeter = 8 cm b= 6 cm Do Questions 2 Pythagoras Theorem 3cm 8 cm =36 cm

5 9.4 cm End of Slide Circumference of Circles Press 14 cm 2 π r2 π r D= 6 cm L=6 cm B 11 cm Do Questions 3 and 4 P = 0.5 x 11 cm [r=3cm] 2 π 32 π ≈ ≈ 37.4 cm

cm 15 cm End of Slide Circumference of Circles Press 0.25 x 2 π r r= 9 cm L=9 cm B 6 cm Do Questions 5 P = 0.25 x2 π 92 π ≈ ≈ 44.1 cm 6 cm

7 End of Slide b a c 2 = a 2 + b 2 3 cm c2 = c2 = c 2 = 25 c 4 cm c= 5 5 cm

8 End of Slide r Circumference = 2π r = 6 cm = 2 x π x 6= 2 x π x 6 ≈ 37.7 cm