THE WORLD OF SHAPES CIRCLES.

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Presentation transcript:

THE WORLD OF SHAPES CIRCLES

CIRCLE A circle is such a closed curve whose every point is equidistant from a fixed point called its center.

Center: The center of a circle is a fixed point within the circle from which all the points of the closing curve are equidistant.

Radius: The distance from the centre to any point on the circumference of a circle is called the radius of the circle. The symbol of the radius is r.

Chord: ALINE SEGMENT WHICH JOINS ANY TWO POINTS ON THE CIRCLE. Here, O is the centre. OP is one radius. AB is a diameter. MN is a chord . (line-segment) OA and OB are also radii.

Diameter: The line-segment passing through the centre and meeting the points on the circumference is called the diameter of the circle. Diameter is denoted by 'D'. AB is a diameter of the circle. Diameter is twice the length of the radius concerned. Thus, D = 2r [Diameter = 2radius] or r = D/2 [Radius = Diameter/2]