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# Geometry

### Topic8

TermDefinition
Line A straight path of points that goes on and on in both directions
Intersecting lines Lines that cross at one point
Perpendicular lines Two intersecting lines that form right angles
Parallel lines In a plane, lines that never intersect
Point An exact location in space
Plane An endless flat surface
Angle A figure formed by two rays that have the same endpoint
Acute angle An angle that is less than a right angle
Obtuse angle An angle that is greater than a right angle
Right angle An angle that forms a square corner
Line segment A part of a line that ends in two end points
Ray A part of a line that has one endpoint and continues endlessly in one direction.
Straight angle An angle that forms a straight line
Pentagon A polygon with five sides
Hexagon A polygon with six sides
Quadrilateral A polygon with four sides
Polygon A closed plane figure made up of line segments
Triangle A polygon with three sides
Acute triangle A triangle with three acute angles
Vertex, plural vertices The point where two rays meet. The point where the sides of a polygon meet.
Isosceles triangle A triangle with two equal sides
Equilateral triangle A triangle with three equal sides
Right triangle A triangle with one right angle
Obtuse triangle A triangle with one obtuse angle
Parallelogram A quadrilateral with two pairs of parallel sides
Scalene triangle A triangle where all the sides are different lengths
Rhombus A quadrilateral with two pairs of parallel sides, and all the sides the same length
Radius A line segment that connects the edge of a circle with the center
Diameter A line segment that connects two points on a circle an crosses the center
Cube A solid with six square faces
Center The middle of a circle
Trapezoid A quadrilateral with only one pair of parallel sides
Created by: heatherbaca