note 2: perimeter the perimeter is the distance around the outside of a shape. start at one corner...

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Note 2: Perimeter The perimeter is the distance around the outside of a shape. Start at one corner and work around the shape calculating any missing sides. 6 cm 5 cm 2 cm 5 cm Perimeter = 5cm + 3cm + 6cm + 2cm + 11cm + 5cm = 32cm

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Page 1: Note 2: Perimeter The perimeter is the distance around the outside of a shape. Start at one corner and work around the shape calculating any missing sides

Note 2: Perimeter

The perimeter is the distance around the outside of a shape. Start at one corner and work around the shape calculating any missing sides.

6 cm

5 cm

2 cm

5 cm

Perimeter = 5cm + 3cm + 6cm + 2cm + 11cm + 5cm

= 32cm

Page 2: Note 2: Perimeter The perimeter is the distance around the outside of a shape. Start at one corner and work around the shape calculating any missing sides

Note 3: Circumference

The perimeter of a circle is called the circumference.The formula for the circumference is: C = πd or C = 2πrwhere d = diameter r = radius. Example: Find the circumference of

C = 2πr

= 2 x π x 8cm

= 50.3cm (1dp)

Page 3: Note 2: Perimeter The perimeter is the distance around the outside of a shape. Start at one corner and work around the shape calculating any missing sides

If a sector has an angle at the centre equal to x, then the arc length is x/360 of the circumference.

Example: Find the perimeter of the sector

Angle of sector = 360° - 120 ° = 240 °

Arc Length = x/360 x 2πr

= 240/360 x 2 x π x 6m

= 25.1m (1dp)

Perimeter = 2 x 6m + 25.1m

= 37.1m

Page 4: Note 2: Perimeter The perimeter is the distance around the outside of a shape. Start at one corner and work around the shape calculating any missing sides

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