b, c and d all equal 20

3

The radius of a circle is the distance from the centre of the circle to any point of the circumference

180 degrees

4

9cm2

0.8

6

400

10010

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b, c and d all equal 20

3

The radius of a circle is the distance from the centre of the circle to any point of the circumference

180 degrees

4

9cm2

0.8

6

400

10010

2

2100

250

100

4