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# Unit 12 CC Math Voc

### Geometry

TermDefinition
Intersecting lines Lines that cross at one point.
line A straight path of points that goes on and on in the same direction.
Perpendicular lines Two intersecting lines that form right angles
Parallel lines In a place, lines that never intersect.
Point An exact location in space
Plane An endless flat surface
acute angle An angle that is less than a right angle.
angle A figure formed by two rays that have the same meeting point
Obtuse angle An angle that is greater than a right angle.
Line segment A part of a line that has two endpoints.
Right angle An angle that forms a square corner.
Ray A part of a line that has one endpoint and continues endlessly on one direction.
Straight angle An angle that forms a straight line.
Protractor A tool used to measure and draw angles.
Degrees The measurement used for angles.
Side Each of the line segments of a polygon.
Vertex The point where two rays meet to form an angle
Octagon A polygon with 8 sides.
Quadrilateral A polygon with 4 sides.
Polygon A closed plane figure made up of line segments.
Triangle A polygon with 3 sides.
Unit angle The turn or bend between two intersecting lines, line segments, rays, or planes.
Obtuse Triangle A triangle in which there is one obtuse angle.
Right Triangle A triangle in which there is one right angle.
Parallelogram A quadrilateral in which opposite sides are parallel
Rhombus A quadrilateral in which opposite sides are parallel, all sides are the same length.
Trapezoid A quadrilateral with only one pair of parallel sides.
Square A quadrilateral with four right angles, all sides the same length.
End point Either of two points marking the end of a line segment
Two dimensional figure A figure that has length and width but not height.
Line of Symmetry A line in which a figure can be reflected, resulting in a figure that looks exactly like the original.
Symmetric A figure where one side is a mirror image/ reflection
Rectangle A quadrilateral with four right angles
Acute triangle A triangle with 3 acute angles.