**Area**- The space a shape takes up.

- Describe in square units 4cm2.

*Area of square or rectangle.*

**Review****eg.**

**A = L x W**

A = 6 x 2

A = 12cm2

**Parallelogram:**

**eg.**

A = bxh

A = 10 x 5

A = 50cm2

**Finding Area of a circle.**

Use pieces of circle to create to

a shape very close to a parallelogram.

**h = radius of a circle**

Close to parallelogram.

Close to parallelogram.

b = 1/2 circumference

Ap = b x h

Ao = 2 pi r/2 x r

Ao = pi x r x r

Ao = pi r 2

Find the area of a circle with a radius of 10m. Formula and work.

Ao = pi r 2

Ao = 3.14 x 10 2

Ao = 3.14 x 100

Ao = 314 m2

Find Area of following circles.

Answer for "8 cm":

Ao = pi r 2

Ao = 3.14 x 8 2

Ao = 3.14 x 64

Ao = 200.96cm 2

Answer for "14.8m":

Ao = pi r 2

Ao = 3.14 x 14.5 2

Ao = 3.14 x 219.64

Ao = 687.79cm 2

Answer for "6.8 m":

r = d/2

r = 6.8/2

r = 3.4

Ao = pi r 2

Ao = 3.14 x 3.4 2

Ao = 3.14 x 11.56

Ao = 36.30m 2

Answer for "20 cm":

r = d/2

r = 20/2

Ao = pi x 2

Ao = 3.14 x 10 2

Ao = 3.14 x 100

Ao = 314cm 2

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