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Practice 18 Circles

1 Clearly define, with the aid of diagrams, the meaning of
a an ar of a circle
2 Fnd the circumterence of
4 Find the diameter of a circle with circumference 30 cm.
6 Find the area of:
3 A circular hoop has a radius of 40 cm. Find the length of ubing necded to make
the hoop.
5 Eva walks 500 m to conplete one lap ofa circular walking trail. Find the radius of
the trail.
7 A gardener is making a path using
S cylindrical concrete pavers. Each paver
has a radius of 20 cm, and is 5 cm thick.
a Find the total area of the tops of the