Circles and Circumference

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Presentation transcript:

Circles and Circumference

Definitions Circle – the locus (set) of all points in a plane equidistant from a given point called the center. A circle is usually named by the center point. D Circle Center Point

Definitions C Diameter – a chord that passes through the center point. CE is a diameter F D Radius – any segment with endpoints that are the center and a point on the circle. CF, EF, and DF are all radii. E

Some Important Facts! Diameter is twice the radius. D = 2R Radius is one-half the diameter R = ½ D Circumference is the distance around a circle. C = d or C = 2r

Work this problem! The diameter of Circle X is 22 cm C =  D C = (3.14)(22 cm) C = 69.08 cm = 69.1 cm

Work this problem Find the circumference of circle K. To find circumference we need either the diameter or radius. K 3 So, C = 2r C = (2)(3)(3.14) C = 18.8 units

An actual answer on a geometry test.