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### 68 Cards in this Set

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• Back
 Geometry the mathematical study of space and objects in space Protractor a tool used to measure angles Coordinate Grid a device for locating points in a plane using ordered numbered pairs, or coordinates Compass a tool used to draw circles Endpoints a point at the end of a line segment or ray. A line segment is normally named using the letter labels of its endpoints Degree unit of measure used for the size of an angle Line Segment a straight path joining two points Line a straight path that extends infinitely in opposite directions Ray a straight path that extends infinitely from its endpoint Intersect lines that meet Parallel two lines, line segments, or rays, next to each other that can never cross Perpendicular two lines that intersect at right angles Right Angle a 90 degree angle Obtuse Angle an angle between 90 & 180 degrees Acute Angle an angle between 0 & 90 degrees straight angle an angle that measures 180 degrees reflex angle an angle between 180 and 360 degrees vertex the point where the rays of an angle, the sides of a polygon, or the sides of a polyhedron meet polygon a 2 demensional figure with 3 or more sides. All sides must be closed and none curved. regular polygon a polygon with all sides and angles the same size interior the inside convex all sides pushed out concave all sides pushed in side one of the line segments that makes up a polygon triangle a polygon with three sides quadirlateral a polygon with four sides pentagon a polygon with five sides hexagon a polygon with six sides heptagon a polygon with seven sides ocgtagon a polygon with eight sides nonagon a polygon with nine sides decagon a polygon with ten sides scalene triangle a triangle with all sides different isosceles triangle a triangle with two sides are the same equilateral triangle a triangle with three sides the same right triangle a triangle with a right angle acute triangle a triangle with all angles are acute obtuse triangle a triangle with one obtuse angle parallelogram a quadrilateral shape with two parallel sides trapezoid a quadrilateral shape with one pair of parallel sides rhombus a quadrilateral shape with all sides the same length rectangle a parallelogram with four right angles square a parallelogram with four equal sides and angles kite a quadrilateral with two pairs of adjacent equal sides. The sides cannot be of equal length, so a rhombus cannot be a kite. radius connects the center of the circle with any point on the circle diameter passes through the circle and has endpoints on the circle center middle of the circle arc part of the outline of a circle face a flat surface edge where surfaces meet base the bottom cube a polyhedron with six square faces, 12 vertices and 8 edges triangular prism a prism whose bases are triangles rectangular prism prism with rectangular bases cone a three dimensional shape with a circular base and one vertex called the apex pyramid traingular prism or tetrahedron cylinder a three dimensional shape that has two circular bases that are parallel and conguant and connected by a curved surface. sphere a set of all points in space a given distance from a given point. The given point is the center of the sphere, the given distance is the radius. congruent exactly the same shape and size similar exactly the same shape but not necissarily the same size symmetry the same line of symmetry line drawn through a figure image reflection of an object pre-image the original image before a transformation reflection the flipping of a figure over a line rotation turns transition a movement of a figure along a straight line transformation an operation on a figure that produces another figure