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Math Vocab


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 mirror-image 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
Created by: mdancer