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Geometry Term

geomtry terms

Acute triangle A triangle in which all three angles are acute Examples:
Angle A figure formed by two rays that have a common endpoint Example:
Chord A line segment with its endpoints on a circle Example:
Circle A closed plane figure with all points on the figure the same distance from the center Example:
Circumference The distance around a circle Example:
Closed figure A figure that begins and ends at the same point Examples:
Cone A solid figure that has a circular base and one vertex Examples:
Congruent Having the same size and shape Example: The triangles are congruent.
Congruent figures Figures that have the same size and shape Example: The triangles are congruent.
Coordinate plane A plane formed by two intersecting and perpendicular number lines called axes Example:
Coordinates The numbers in an ordered pair Example:
Cube A solid figure with six congruent square faces Examples:
Cylinder A solid figure that has two parallel bases that are congruent circles Examples:
Degree (°) A unit for measuring angles and temperature Examples:
Diameter A line segment that passes through the center of a circle and has its endpoints on the circle Example: diameter
Dimension A measure in one direction; the length, width, or height of a figure
Edge The line segment where two faces of a solid figure meet Example: edge
Equilateral triangle A triangle with three congruent sides Example:
Face A polygon that is a flat surface of a solid figure Example: face
Figurate numbers Numbers that can be represented by geometric figures Examples:
Hexagon A polygon with six sides and six angles Examples:
Hypotenuse In a right triangle, the side opposite the right angle; the longest side in a right triangle Example: hypotenuse
Intersecting lines Lines that cross at exactly one point Example: Line EF intersects line GH.
Isosceles triangle A triangle with two congruent sides Example:
Line A straight path in a plane that goes on forever in opposite directions Example: line AB or line BA
Line segment A part of a line that includes two points, called endpoints, and all of the points between them Example: line segment AB or line segment BA
Line symmetry A figure has line symmetry if a line can separate the figure into two congruent parts Example:
Obtuse angle An angle whose measure is greater than 90° and less than 180° Example:
Obtuse triangle A triangle that has one obtuse angle Example:
Octagon A polygon with eight sides Examples:
Ordered pair A pair of numbersthe first number tells how far to move horizontally and the second number tells how far to move vertically
Parallel lines Lines in a plane that never intersect Example:
Parallelogram A quadrilateral whose opposite sides are parallel and congruent Examples:
Pentagon A polygon with five sides Examples:
Perpendicular lines Two lines that intersect to form four right angles Example:
pi (Noun) The ratio of the circumference of a circle to its diameter An approximate decimal value of pi is 3.14.
Plane A flat surface that extends without end in all directions Example: Planes are named by three points in the plane.
Plane figure A figure which lies in a plane Examples:
Point An exact location in space, usually represented by a dot Example: point A
Point symmetry When a figure can be turned half way about a central point and still look the same Example:
Polygon A closed plane figure formed by three or more line segments Examples:
Polyhedron A solid figure with flat faces that are polygons Examples:
Prism A solid figure that has two congruent, polygon-shaped bases, and other faces that are all rectangles Examples: rectangular prism triangular prism
Protractor A tool used for measuring or drawing angles Example:
Pyramid A solid figure with a polygon base and all other faces triangles that meet at a common vertex Example: This is a square pyramid
Quadrilateral A polygon with four sides
Radius A line segment with one endpoint at the center of a circle and the other endpoint on the circle Example: radius
Ray A part of a line, with one endpoint, that continues without end in one direction Example: ray CD
Rectangle A parallelogram with four right angles
Created by: 17sncollins