## Gordon Geometry

##### Created by:

moorea89  on October 21, 2012

##### Copied From:

Set copied from gordone

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# Gordon Geometry

 polygonany closed flat figure with straight sides
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#### Definitions

polygon
any closed flat figure with straight sides
triangle
a polygon with 3 sides and 3 angles
square
a quadrilateral that has four congruent sides and four right angles
rectangle
a quadrilateral with four right angles who opposite sides are parallel
pentagon
a polygon with five sides
hexagon
a polygon with six sides
any polygon with four straight sides
line
a straight line that goes on forever in both directions (shown with arrows)
line segment
part of line with two endpoints (shown with dots)
ray
part of a line with one endpoint and going on forever in one direction (shown with a dot on one end and an arrow on the other)
parallel lines
lines on a flat surface that never meet; they are always the same distance apart
intersecting lines
lines that meet or cross at a common point
right angle
an angle that forms a square corner (90 degrees)
acute angle
an angle that is less than a right angle (less than 90 degrees)
obtuse angle
an angle that is greater than a right angle (more than 90 degrees)
congruent figures
figures having the same size and shape
similar figures
figures that have the same shape but aren't the same size
ordered pairs
help you locate points on a graph; (5,1) tells you to move across 5 and up 1
line of symmetry
a line on which a figure can be folded so that the two halves match exactly
slide
a move in a straight line without changing direction
flip
a move over an imaginary line that puts the object in the opposite direction or on the opposite side
turn
a move clockwise or counterclockwise around a point
face
a flat side of a space figure
edge
the line segment where two faces of a space figure meet
corner
where 3 or more edges meet on a space figure; also called a vertex (plural = vertices)
perimeter
the distance around a figure or an object
area
the number of square units needed to cover a surface
volume
the number of cubic units in a space figure
right triangle
a triangle with one right angle
isosceles triangle
a triangle with at least 2 equal sides
equilateral triangle
a triangle with all the sides being equal
scalene triangle
a triangle with no equal sides
solid figures
shapes that take up space; they are three-dimesional NOT flat

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