Compound Shapes Perimeter Demonstration This resource provides animated

Compound Shapes – Perimeter – Demonstration This resource provides animated demonstrations of the mathematical method. Check animations and delete slides not needed for your class.

Farmer Ann builds 2 pig-pens using fencing. How much fencing was used for each pig pen? 1 m

For every polygon (flat shape) we can find the perimeter. 1 m The total length of the edge of the shape. Imagine walking around the outside Perimeter = 10 m

1 cm Why don’t these shapes have a pair? How many different shapes can you draw with a perimeter of 10 cm 2 ?

How can we find the missing lengths in these diagrams? 2 6 6? 3 9? 8 8? 12 4 (not drawn accurately) 10 7 4? 7

Calculate the perimeter of this compound shape. 2 cm Perimeter: (‘Walk’ around the outside) 2+2+2+4+4+2 2 cm = 16 cm 4 cm 2 cm 4 cm

Calculate the perimeter of this compound shape. Perimeter: (‘Walk’ around the outside) 5 cm 5+6+2+2+3+4 4 cm = 22 cm 6 cm 3 cm 2 cm

Calculate the perimeter of this compound shape. Calculate & label missing lengths. Perimeter: (‘Walk’ around the outside) 4 cm 4 + 3 + 6 + 5 + 10 + 8 = 36 cm 3 cm 8 cm 6 cm 5 cm 10 cm

Calculate the perimeter of this compound shape. Calculate & label missing lengths. Perimeter: (‘Walk’ around the outside) 3 cm 4+5+3+9+7+4 = 32 cm 5 cm 4 cm 7 cm 9 cm

Calculate the perimeter of this compound shape. Calculate & label missing lengths. Perimeter: (‘Walk’ around the outside) 4 cm 2 + 5 + 4 + 3 + 10 + 3 = 36 cm 5 cm 2 cm 4 cm 3 cm 10 cm 8 cm

Perimeter: What’s the same, what’s different? 10 cm 12 cm

2 m Calculate the perimeter of each compound shape. 3 cm A) 3 cm B) Perimeter = 36 m 10 m 3 cm 6 m 6 cm 3 cm Perimeter = 24 cm 2 m 8 m 6 cm 8 cm C) 2 cm 5 cm Perimeter = 26 cm 9 m D) 9 m Perimeter = 44 m 3 cm 3 m 2 m

Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated . Please feel free to email: tom@goteachmaths. co. uk