Math
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rectangle  a parallelogram w/ 4 right angles  
ray  a part of a line that starts at one endpoint and extends forever  
complementary angles  two angles whose measures add to 90  
center of rotation  the point about which a figure is rotated  
congruent  having the same size and shape  
correspondence  the relationship between 2 or mre objects that are matched  
equilateral triangle  a triangle w/ 3 congruent sides  
image  a figure resulting from a transformation  
isosceles triangle  a triangle w/ at least 2 congruent sides  
line  a straight path that extends w/o end in opposite directions  
line of symmetry  the imaginary "mirror" in line symmetry  
line symmetry  a figure has line symmetry if one half is a mirrorimage of the other half  
obtuse angle  an angle whose measure is greater than 90 but less than 180  
obtuse triangle  a triangle containing one obtuse angle  
parallel lines  lines in a plane that do not intersect  
parallelogram  a quadrilateral w/ 2 pairs of parallel sides  
perpendicular lines  lines that intersect to form right angles  
plane  a flat surface that extends forever  
point  an exact location is space  
polygon  a closed plane figure formed by 3 or more line segments that intersect only at their endpoints (vertices)  
vertical angles  a pair of opposite congruent angles formed by intersecting lines  
rhombus  a parallelogram w/ all sides congruent  
right angle  an angle that measures 90  
right triangle  a triangle containing a right angle  
rise  the vertical change when the slope of a line is expressed as the ratio rise over run  
rotation  a transformation in which a figure is turned around a point  
rotational symmetry  a figure has rotational symmetry if it can be rotated less than 360 around a central point and coincide w/ the original figure  
run  the horizontal change when the slope of a line is expressed as the ratio rise over run  
scalene triangle  a triangle w/ no congruent sides  
segment  a part of a line between 2 endpoints  
semiregular tessellation  a tessellation formed w/ 2 or more regular polygons in which every vertex is identical  
slope  a measure of the steepness of a line on a graph, the rise divided by the run  
square  a rectangle w/ 4 congruent sides  
supplementary angles  two angles whose measures have a sum of 180  
tessellation  a repeating pattern of plane figures that completely cover a plane with no gaps or overlaps  
transformation  a change in size or position of a figure  
translation  a movement (slide) of a figure along a straight line  
transversal  a line that intersects two or more lines  
trapezoid  a quadrilateral w/ exactly one pair of parallel lines  
regular tessellation  a tessellation formed by using regular polygons  
regular polygon  a polygon w/ congruent sides and angles  
angle  a figure formed by 2 rays w/ a common endpoint called the vertex  
acute triangle  a triangle w/ angles measuring less than 90  
acute angle  an angle that measures less than 90  
reflection  a transformation of a figure that flips the figure across a line  
Triangle Sun Theorem  the theorem that states that the measures of the angles in a triangle add up to 180 
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Created by:
mdancer