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Add up the lengths of all the sides:

9 mm + 6.5 mm + 7 mm = 22.5 mm

1. Fill in the lengths of the missing sides: 14 cm and 5 cm
2. Add the lengths of all the sides: 14 cm + 5 cm + 14 cm + 5 cm = 38 cm

1. Calculate the lengths of the missing sides.

The total height of the shape is 10 m, subtracting 6 m leaves us with the length of the missing edge of 4 m.

The total width is missing – this has been split up into 3 m and 6 m. By adding them together we find the missing edge is 9 m.

2. Add all the lengths together:

3 m + 6 m + 6 m + 4 m + 9 m + 10 m = 38 m

• Calculate the perimeter: 5 m + 14 m + 7 m + 20 m = 46 m
• Calculate how many units of fencing is needed: 46 m ÷ 2 m = 23
• Calculate how much 23 panels will cost: 23 × £30 = £690