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Line A straight path of points that goes on forever in two directions.
Ray Part of a line that has one end point and extends forever in one direction.
Parallel Lines In a plane, lines that never cross and stay the same distance apart.
Intersecting Lines Lines that pass through the same point.
Perpendicular Lines Two lines that intersect form square corners or right angles.
Point An exact location in space.
Line segment Part of a line having two end points.
Plane An endless flat surface.
Angle Two rays that have the same endpoint.
Acute Angle An angle whose measures is between 0˚ and 90˚ degrease.
Right Angle An angle whose measure is 90˚.
Obtuse Angle An angle whose measure is between 90˚ and 180˚.
Straight Angle An angle measuring 180˚.
Vertex The common endpoint of the two rays in an angle.
Protractor An instrument that is the result of multiplying two or more factors.
Degrees A unit of measure for angles and temperature.
Polygon A closed plane figure made up of line segments.
Regular Polygon A polygon that has sides of equal length and angles of equal measures.
Triangle A polygon with 3 sides.
Quadrilateral A polygon with 4 sides.
Pentagon A polygon with 5 sides.
Hexagon A polygon with 6 sides.
Octagon A polygon with 8 sides.
Equilateral Triangle A triangle whose sides all have the same length.
Isosceles Triangle A triangle with two sides are the same length.
Scalene Triangle A triangle which no sides are the same length.
Right Triangle A triangle which on angle is a right angle.
Acute Triangle A triangle whose angles are acute angles.
Created by: GINJANINJA018