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# Geometry terms DOC

### Geometry Terms

A triangle in which all three angles are acute acute triangle
A figure formed by two rays that have a common endpoint Angle
A line segment with its endpoints on a circle Chord
A closed plane figure with all points on the figure the same distance from the center Circle
The distance around a circle Circumference
A figure that begins and ends at the same point Closed figure
A solid figure that has a circular base and one vertex Cone
Having the same size and shape Congruent
Figures that have the same size and shape Congruent figures
A plane formed by two intersecting and perpendicular number lines called axes Coordinate plane
The numbers in an ordered pair Coordinates
A solid figure with six congruent square faces Cube
A solid figure that has two parallel bases that are congruent circles Cylinder
A unit for measuring angles and temperature Degree (°)
A line segment that passes through the center of a circle and has its endpoints on the circle Diameter
A measure in one direction; the length, width, or height of a figure Dimension
The line segment where two faces of a solid figure meet Edge
A triangle with three congruent sides Equilateral triangle
A polygon that is a flat surface of a solid figure Face
Numbers that can be represented by geometric figures Figurate numbers
A polygon with six sides and six angles Hexagon
In a right triangle, the side opposite the right angle; the longest side in a right triangle Hypotenuse
Lines that cross at exactly one point Intersecting lines
A triangle with two congruent sides Isosceles triangle
A straight path in a plane that goes on forever in opposite directions Line
A part of a line that includes two points, called endpoints, and all of the points between them Line segment
A figure has line symmetry if a line can separate the figure into two congruent parts Line symmetry
A triangle that has one obtuse angle Obtuse triangle
A polygon with eight sides Octagon
A pair of numbers used to locate a point on a coordinate plane; the first number tells how far to move horizontally and the second number tells how far to move vertically Ordered pair
Lines in a plane that never intersect Parallel lines
A quadrilateral whose opposite sides are parallel and congruent Parallelogram
A polygon with five sides Pentagon
Two lines that intersect to form four right angles Perpendicular lines
The ratio of the circumference of a circle to its diameter pi
A flat surface that extends without end in all directions Plane
A figure which lies in a plane Plane figure
An exact location in space, usually represented by a dot Point
When a figure can be turned half way about a central point and still look the same Point symmetry
A closed plane figure formed by three or more line segments Polygon
A solid figure with flat faces that are polygons Polyhedron
A solid figure that has two congruent, polygon-shaped bases, and other faces that are all rectangles Prism
A tool used for measuring or drawing angles Protractor
A solid figure with a polygon base and all other faces triangles that meet at a common vertex Pyramid
A polygon with four sides Quadrilateral
Created by: 17rcombs