Draw any circle and mark:
(a) A diameter.
(b) A sector

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Solution

(a) A diameter of a circle is a line segment that passes through the centre of the circle and whose endpoints lie on the circle.

Here, AB is the diameter of the circle.

(b) A region in the interior of a circle enclosed by an arc on one side and a pair of radii on the other two sides is called a sector.

Here, OAB is the sector of the circle.

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