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