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# Geometry Topic 9

A straight path of points that goes on and on in two directions. line
Lines that cross at one point. intersecting lines
Two intersecting lines that form right angles. Perpendicular lines
In a plane, lines that never intersect. Parallel lines
An exact location in space. Point
An endless flat surface. Plane
A figure formed by two rays that have the same endpoint. Angle
An angle that is less than a right angle. Acute angle
An angle that is greater than a right angle. Obtuse angle
A part of a line that has two endpoints. Line segment
An anlge that forms a square corner. Right angle
A part of a line that has one endpoint and continues endlessly in one direction. Ray
An angle that forms a straight line. Straight angle
A tool used to measure and draw angles. Protractor
The measurement used for angles. Degrees
Each of the line segments of a polygon. Side
A polygon with six sides. hexagon
The point where two rays meet to form an angle. The point where the sides of the polygon meet. The point where three or more edges meet in a solid figure that does not roll. The pointed part of a cone. Vertex (plural,vertices)
A polygon with five sides. Pentagon
A polygon with eight sides. Octagon
A polygon with four sides. Quadrilateral
A closed plane figure made up of line segments. Polygon
A polygon with three sides. Triangle
A triangle with three acute angles. Acute triangle
A triangle that has at least two equal sides. Isosceles triangle
A triangle in which all sides are the same length. Equilateral triangle
A triangle in which there is one right angle. Right triangle
A triangle in which there is one obtuse angle. Obtuse triangle.
A quadrilateral in which opposite sides are parallel. Parallelogram
A triangle in which no sides are the smae length. Scalene triangle
A quadrilateral in which opposite sides are parallel and all sides are the same length. Rhombus
A quadrilateral with four right angles. Rectangle
A quadrilateral with only one pair of parallel sides. Trapezoid
A quadrilateral with four right angles and all sides the same length. Square