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Area and Circumference of a Circle

The circle has a diameter of 12 cm. Calculate a.

The circumference b. The area

12 cm

a. Circumference ?d C 3.14 x 12 C 37.68 cm

b. Area ?r2 A 3.14 x 6 x 6 A

113.04 cm2

A circular pond has a diameter of 5 metres and a

1 meter wide path runs all the way around its

edge. Calculate the area of the path.

5 m

b. Area ?(R r)(R r) A 3.14(3.5

2.5)(3.5 2.5) A 3.14 x 6 x 1

A 18.84 m2

B

The circle has a diameter of 12 cm

720

- a. Calculate the arc length AB to 1 d.p
- Calculate the area of the sector AOB to 1 d.p.

A

O

- Arc AB (72 360) x (?d)
- AB 0.2 x 3.14 x 12
- AB 7.5 cm
- b. Area sector AOB (72 360) x (?r2)
- AOB 0.2 x 3.14 x 62
- AOB 22.6 cm2

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