Angles Formed by Parallel Lines Quick Reference Sheets

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Circles: Properties and Formulas Graphic Organizer/Reference (p.1)

Parts of a circle

Center: The point inside of a circle

from which all points on the circle are equidistant Radius: A segment that goes from

Secant

the center to the side, half of the

diameter

Center

Diameter: A chord that passes

through the center of the circle Chord: A segment with its endpoints on the circle Secant: a line that intersects a

Point of Tangency

Diameter Chord

circle in exactly two places Tangent: A line or segment that

Tangent

intersects a circle at exactly one

point called the point of tangency

Arcs on a circle

Minor Arc: An arc that is less than 180 degrees and is equal to the central angle Major Arc: An arc that is greater than 180 degrees and is equal to 360 minus the minor arc/central angle Semicircle: An arc that is equal to half a circle which is 180 degrees exactly Arc Addition Postulate: The measure of an arc formed by two adjacent arcs is the sum of the measures of the arcs.

Major arc CAD

Minor arc CD

Semicircle BD

Arc Addition Postulate

BCD = BC + CD

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