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Radius of a Circle

O is the cent...

Question

O is the centre of the given circle. Which of the lines OA, OB, OC, OD, BD, or BA are the radii (plural of radius) of the circle? Justify.

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Solution

A radius is a line that connects the centre to any point on the boundary of the circle.

From the figure, only OA, OB, and OC connect the centre O to a point on the circle.
So, OA, OB, and OC are the radii of the given circle.

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