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C IRCLES Identifying parts of the circle
V OCABULARY Radius Chord Diameter Arc Center
C ENTER AND A RC A circle can be named by its center. A circle with a center labeled C would be named circle C. An unbroken part of a circle is called an arc. B C A
R ADIUS A radius connects the center with a point on the circle. radius CD D C
CHORD A chord connects two points on a circle. chord AB A B
DIAMETER A diameter is a chord that passes through the center of a circle. diameter AB A B
L ESSON Q UIZ Use the given diagram for the following: 1. Name two radii. 2. Name two chords. 3. Name the center of the circle. 4. Name a diameter. 5. Name an arc of the circle. H A G J E D F C B K
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2x2x x This is the ARC o Centre of Circle The Angle x subtended at the centre of a circle by an arc is twice the size of the angle on the circumference.
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