Finding the Perimeter of Shapes

What is the perimeter of a shape?

• The space inside the shape

• The edge or border of a shape

• Both A and B

• Neither A or B

How do you calculate the perimeter of a shape?

• Add all the sides together (SOAS)

• Multiply the length by the width

• Add the length and width together

• A = l x w

What is the perimeter of this shape?

• 17mm²

• 17mm

• 168mm

• 13mm

How do you calculate the perimeter of a rectangle with sides l and w?

• b x h

• 2l +2w

• 2 (l + w)

• l x w

Find the perimeter of the shape.

(Note the dots are each 1 unit apart)

• 10 units

• 6 units

• 8 units

• 7 units

What is the perimeter of this shape?

(Note the dots are each 1 unit apart)

• 9 units

• 18 units

• 14 units

• 12 units

What is the perimeter of this shape?

(Note the dots are each 1 unit apart)

• 16 units

• 20 units

• 18 units

• 19 units

Determine the perimeter of this shape.

• 17 units

• 18 units

• 14 units

• 16 units

A rectangle has sides of 3m and 7m.

What is the perimeter of the rectangle?

• 10m

• 4m

• 8m

• 20m

A triangle has sides of 2m, 5m and 6m.

What is the perimeter of the triangle?

• 13m

• 60m