math review

linear pair

a pair of adjacent <s whose uncommon sides form 2 pairs of opp rays

vertical <s

a pair of <s whose sides form opp rays

median

is a segment from a vertex to the midpoint to the opp. side of the triangle

circle inscribed in a polygon

iff each side of the polygon is tangent to the circle

polygon inscribed in a circle

iff the circle contains all of its vertices

cyclic polygon

has a circle that contains all it’s vertices

tangent segment

is part of a tangent line that has a point of tangency as one endpoint

semicircle

is 180 degrees or half a circle

arc

part of a circle

minor arc

is less than 180 degrees

major arc

is greater than 180 degrees

central angle

an < whose vertex is the center of a circle

degree measure of an arc

is the measure of its central <

inscribed angle

whose vertex is in a circle with each side intersecting the circle at another point

secant to a circle

a line that intersects the circle at 2 points

secant angle

is an angle whose sides lie in 2 secants of a circle so that each intersvets the circle in at least one point other than the vertex