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Published byClifton Webb Modified over 6 years ago

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Geometry The strand of math that deals with measurement and comparing figures, both plane and solid .

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Open Figure Closed Figure

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Attributes A quality that is characteristic of someone or something.

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Congruent – figures that have exactly the same size and same shape

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Side – any of the line segments that form a polygon Side

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Plane – A flat surface that goes on forever in all directions

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Plane Figure – Any two-dimensional figure

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**Lines parallel lines Lines in a plane that never intersect Example:**

perpendicular lines Two lines that intersect to form four right angles Example:

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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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**Angles angle A figure formed by two rays that have a common endpoint**

Acute angle An angle that has a measure less than a right angle (less than 90°) Example: obtuse angle An angle whose measure is greater than 90° and less than 180° Example:

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Polygon – a closed plane figure with straight sides

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Quadrilateral – a four sided polygon

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**Square – A plane figure with four sides that are the same length**

and four right angles

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Rectangle – a plane figure with four sides and four right angles

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Triangle – A plane figure with three straight sides

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Pentagon – a five-sided polygon

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**Trapezoid – a quadrilateral with only**

one pair of parallel sides

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**Rhombus – a parallelogram whose four sides are congruent and**

opposite angles are congruent

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Hexagon – a six sided polygon 1 6 2 5 3 4

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**Octagon – An eight-sided polygon**

STOP

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**Parallelogram – any four sided polygon with two pairs**

of parallel lines

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– A figure with 3 dimensions; not flat Solid figure

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– having length, width, height, and volume Three Dimensional

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**Three-Dimensional Figures**

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**Horizontal Horizontal – the direction from left to right V E R T I C A**

Vertical – The direction from top to bottom

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**– A place where two or more sides meet on a geometric solid**

Edge – A place where two or more sides meet on a geometric solid Edge

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Face – A flat side on a geometric solid Face

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**Vertex – a corner; a place where three or more sides meet in**

a geometric solid

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Vertices – more than one corner Vertex

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**Cube – A solid figure with six congruent square faces**

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**Prism – A 3-dimensional figure that has two congruent and parallel**

faces that are polygons. The rest of the faces are parallelograms Hexagonal prism rectangular prism

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**Rectangular Prism – A solid figure in which all six faces are**

rectangles

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**Pyramid – a polyhedron whose base is a polygon whose other faces**

are triangles that share a common vertex

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**Square Pyramid square pyramid**

A pyramid with a square base and four triangular faces Example:

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**Sphere – any round object whose curved surface is the same**

distance to the center as all of its points

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– Cylinder A solid figure with two circular bases that are parallel and congruent

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Cone – a solid figure with one curved surface, one circular base, and one vertex Vertex Circular Base

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**Base – A special face of a solid figure**

The base of a cone is a circle.

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