2. 1 MeasuringDevices Press Ctrl-A ©2009 – Not to be sold/Free to use Stage 4 - Year 7

3. 2Perimeter addall To find the perimeter of a polygon add the lengths of all sides. 2cm 1.5 cm P = 2 + 2 + 1.5 = 5.5 cm 2cm 1cm 5cm 4cm P = 1 + 2 + 4 + 5 = 12 cm End of Slide Perimeter Button

4. 3 5 cm 1 S S S S 2 3 4 P = 4s = 4 x 5 = 20 cm P = 4s Perimeter -Square End of Slide Perimeter Button

5. 4 3 cm 5 cm L L B B P = L + L + B + B = 2L + 2B = 2 x 5 + = 10 + = 16 cm 2 x 32 x 3 6 Perimeter - Rectangle End of Slide Perimeter Button

6. 5 2cm 12cm P = 2 P = 60 cm 4cm 10cm 8cm 10cm ?cm 10-4-2 4 + 10+ 4+ 4+ 8+ 8 + 4+ 4 + 12 Perimeter – Composite Shapes End of Show