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### 73 Cards in this Set

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 two angles that share a common vertex and a common side between them adjacent angles a quadrilateral with two pairs of parallel sides parallelogram a triangle with the degree bigger than 90 degrees obtuse a parallelogram with four right angles rectangle a triangle in which all angles are equal. equiangular if line segment of any two interior points is completely inside figure convex region inside an angle interior in a regular n-gon, any angle with vertex at the center of a regular polygon and sides containing adjacent vertices of the polygon central angle the union of two rays that have a common endpoint angle a diameter divides a circle into two parts semicircles has 8 sides octagon a triangle with a 90 degree angle right the sum of the measures of two angles is 180 degrees supplementary angles two lines that intersect to form right angles perpendicular lines an angle whose measure is 90 degrees right angle an angle whose measure is betwwen 90 and 180 degrees obtuse two lines that meet intersecting planes form a straight line intersecting lines has six sides hexagon a triangle in which at least two sides are equal isosceles a triangle in which all sides are equal equilateral has an endpoint and is extended indefinetly in one direction ray a chord that passes throught the center diameter a triangle with no sides equal scalene has four sides quadrilateral In a regular n-gon: each interior angle has a measure (n-2)x180/n. each exterior angle has measure 360/n each central angle has measure 360/n theorem: angle measure in a regular n-gon a tool used to measure angles protractor can be drawn without lifting a pencil and without passing through any point twice simple curve the exterior and the interior of a simple closed curve regions the rays forming an angle sides a quadrilateral with two distinct pairs of congruent adjacent sides kite point M is between points A and B such that M is the same distance from A and B midpoint a set of points that a pencil can trace without lifting until all points are covered curve a quadrilateral with exactly one pair of parallel sides trapezoid the sum of the measures of the interior angles of any n-gon is (n-2) 180 degrees theorem: sum of the interior angle measures of a general polygon refers to a line that intersects (touches) the circle in only one point tangent a dot Always with capital letter A, B,C point formed by the intersection of two flat surfaces and extends indefinitely in both directions a line can be divided into three parts: point, and two-half lines line part of a line, has two end points line segment distance of a line segement length similar to a piece of pie sector has 10 sides decagon points that lie on the same line collinear points two angles such that the sides of one angle forms the sides of the other angle. Only share a common vertex. Have equal measures. vertical angles A simple closed plane curve seperates the plane into three disjoint subsets: the curve itself, the interior, and the exterior Jordan curve theorem an angle whose measure is 180 degrees straight angle region outside an angle exterior consists of two endpoints and all points on the circle between these endpoints arc has seven sides heptagon has the same starting and ending point and drawn without lifting a pencil closed curve refers to a line that intersects the circle in two pints secant line two segments have the same length congruent the set of points in a plane, each of which is the same distance from a fixed point the fixed point lies in the interior and is called the center circle has three sides triangle 1)the sun of the measures of the exterior angles of a convex polygon is 360 degrees 2) the sum of the measures of the interior angles of a conves n-gon is (n-2) 180 degrees theorem: sums of the angle measures in a convex polygon an angle whose measure is between 0 and 90 degrees acute two or more planes that never meet parallel planes a parallelogram with all sides having equal length rhombus segments whose endpoints both lie on the circle chords a rectangle with all sides having equal length square a polygon with all sides equal and all angles equal regular polygon a figure that is not convex concave a flat surface plane three lines intersect in one point concurrent ~ = an angle with the measure greater than 180 but less than 360 degrees reflex two or more lines that lie in the same plane and never meet parallel lines simple closed curve made up of only straight line segments are called sides. polygon is defined to be 1/360 of a complete rotation one degree the common endpoint of an angle vertex a triangle that is less than 90 degrees acute the sum of the measures of two angles is 90 degrees complementary angles two angles that have the same measure congruent angles has 9 sides nonagon has five sides pentagon