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### 71 Cards in this Set

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 Point the basic unit of geometry. It has no size. it is infinitely small. Line straight arrangement of points. It has infinite length but no thickness Plane length and width but no thickness. It is a flat surfrace that extends forever. collinear points points that lie on the same line Coplanar points points that lie on the same plane space the set of all points line segment consists of two points and all the points between them that lie on the line containing the two points end points the two points at the end of a line segment The line AB may be written as... __ __ AB or BA Ray part of a line that contains point A and all the points that are on the same side of point A. Ray AB is written as... __(arrow) AB Vertex The common end point of two rays that form an angle. Sides of an Angle the two rays that meet in vertex Measure of an Angle the smallest amount of rotation necessary from the overlapping position to thefinal angle. degrees the unit used for the measure of an angle protractor the grometric tool used to measure the number of degrees in an angle Congruent segments two segments that the same meassure Congruent angles two angles that are the same in measure Incoming angle the angle formed by the cushion and the path of the ball approaching the chushion. outgoing angle the angle formed by the cushion and the path of the ball leaving the cushion Converse reverse statement Acute angle An angle that s less than 90 degrees Obtuse angle an angle that is over 90 degrees minpoint The exact middle of a line segment angle bisector a line that cut an angle exactly in half Parallel lines two lines that are on the same plane and go in the same direction. They never touch and they are always equidistance from eachother Perpendicular lines Two lines that meet at a 90 degree angle Pair of complemetary angles two angles that add up to be 90 degrees subpplementary angles two angles that add up to be 180 degrees Verticle angles oppsite angles that equal eachother polygon closed geometric figure in a plane formed by connecting line segments endpoint to endpoint with each segent interecting exactly two others. Convex polygon a polygon in which no segment connecting two vertices is outside the polygon concave polygon polygon in which at lesat one segment connecting two vertices is outside the polygon consecutive vertices two vertices of a polygon that are connect by a side consecutive sides two sides that share a common vertex congruent polygons polygons that are exazctly the same size and shape perimeter the sum of the lengths of its sides diagonals of polygons a line that connects to angles that are not next to eachother equilateral polygons polygons whose sides are all the same length equiangular polygons polygon whose angles are the same measure regular polygons a polygons whose sides and angles are all equal right triangle a triangle that who has one angle that equals 90 degrees acute triangle a triangle whose angles are all under 90 deprees obtuse triangle triangle who has one angle greater than 90 deprees scalene triangle triangle that none of the sides are the same measure isosceles triangle a trianle who has two sides that are the same measure medians of triangles a line from the top to the bottom of a triangle that cuts the base exactly in half altitude of a triangle a line that describes the height of the triangle. A triangle has three different altitudes trapezoids a four sided figure inwhich two of the sides are parallel and the other two are not kites a four sided figure in which two consecutive sides are the same and the other two consecutive sides are the same size. parallelograms a four sided shape whose opposet sides are parallel rhombuses any shape whose angles are directly across from eachother (all sides are equal) rectangles a four sided shape whose angles are all 90 degrees square all angles are 90 degrees and all sides are the equalateral prism a shape shapes that are connected in height pyramid a base that meets in a point. It has a height cylinder two circles that connected by a height sphere a globe like shape. hemisphere have of a globe perpendicular bisetor line that divides the line segment into two congruent parts (bisects it) and that is also perpendicular to the line segment transversal a line intersecting two or more other coplanar lines corresponding angles angles that lie on the same place in each line alternate interior angles two angles are the inside of the Z that have the same measure alternate exterior angles two angles that are on the outside of the Z that are the same measure y intercept the point at which a line crosses the y axis probability a measure of the likelihood that an event will have a particular outcome vertex angle the angle between the two sides of equal lengths base angles two angles on the side of the base base the side between the two base angles side side side three paris of congruent sides.. a way to tell congruency x+x, y+y --------- 2 midpoint of a line segment