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angle QI-I ito a annlo acuie igi _ . . y JCOnCl itlOnal formed by two rays with a common endpoint an an 9le with a measure between 0° and 90° A statement that contains the phrase "if and only if. occurs tne ^ conditional and converse are true. formed by switching and negating the hypothesis and conclusion, (you basically switch everything) example: if you like candy, then you like cupcakes contrapositive: if you don't like cupcakes, then you don't like candy. An if then statement ' often > caued a "conditional" Linear Pair A pair of adjacent angles whose noncommon sides are opposite rays, they form a straight line Segment Addition If point B is between points A and c then Postulate > AB+BC=AC two angles whose measures have the sum of 18 de rees each ° 9 ( angle is the supplement of the <;i mnlpmpntarv SUppiei liary annlp^ igies other.) If point B is in the interior of angle AOC, then the of angle AOB + measure of angle BOC equals measure of angle AOC. measure Angle AddltlOn POStUlate ^ i complementary angles two acute angles that add up to 90 degrees. straight angle midpoint is a point that bisects or divides the segmet into two congruent segments collinear To lie on the same line. 2 angles that lie in the same plane and have a common vertex and a common side, but no interior angle bisector is a ray that cuts the angle exactly in half, making two equal angles. Between The point C is between A and B, if A, B, and C are collinear and AC + CB = AB. Congruent Angles Congruent Segments Objects are coplanar if they all lie in the same plane Diameter A chord that passes through the center of a circle. Also refers to the length of the chord. Endnoint cnapomi A oint at the end of a Psegment or ray an object into two congruent parts Tne distance around a circle. Equa, to 2(pj)r or r\f on An/-il^ OT an Mngie (pi)d A point that does not lie between or on the sjdes of the angle Longest side of a right triangle; opposite of the right angle. on Annlo IMn 9' A point that lies between the sides of an angle. Line An undefined term, it is the set of points that extends in opposite directions without end. ObtUSe Angle An angle whose measure is greater than 90 and less than 180 degrees. Opposite raVS Two rays with the same endpoint that extend in opposite directions and form a line. D. Add the lengths of all of the sides of a figure The ratio of the circumference of a circle to the diameter. Pi undefined term of geometry. Flat surface made up of points that has no depth and extends indefinitely in all directions. Represented by a slanted foursided figure. Named by an uppercase script letter or by three non-collinear points on the plane. Plane Point An undefined term represented by a dot, it has no dimension. postulate A statement that is accepted as true without proof. Also called an Axiom Radius A line segment with one endpoint on the circle and the other on the center. Also refers to the segment's length.