## math vocab cards

##### Created by:

THOMASISCOOL  on December 14, 2011

##### Description:

math (geometry) vocab cards

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# math vocab cards

 right anglethe 90 degree angle between two perpendicular lines
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#### Definitions

right angle the 90 degree angle between two perpendicular lines
parallel lines coplanar lines that do not intersect
intersecting lines lines that cross at one point
nonagon a nine-sided polygon
decagon a polygon with 10 sides and 10 angles
isosceles triangle a triangle with two equal sides
scalene triangle a triangle with no two sides of equal length
radius the length of a line segment between the center and circumference of a circle or sphere
central angle an angle whose vertex is the center of the circle
translation the act of uniform movement
reflection a transformation in which the direction of one axis is reversed
line segment part of a line with two endpoints
vertical angles two angles whose sides form two pairs of opposite rays
perpindicular lines lines that intersect to form right angles
dodecagon a twelve-sided polygon
trapezoid a quadrilateral with two parallel sides
arc a continuous portion of a circle
glide reflection a reflection that slides and flips
ray a straight line extending from a point
supplementary angles Two angles whose sum is 180 degrees
polygon a closed plane figure bounded by straight sides
regular polygon a polygon with all sides and all angles equal
parallelogram a quadrilateral whose opposite sides are both parallel and equal in length
sector a plane figure bounded by two radii and the included arc of a circle
rotation a transformation in which the coordinate axes are rotated by a fixed angle about the origin
angle the space between two lines or planes that intersect
complementary angles two angles whose sum is a right angle
pentagon a five-sided polygon
acute triangle a triangle whose interior angles are all acute
rectangle an irregular parallelogram with four right angles
chord a straight line connecting two points on a circle
symmetry an attribute of a shape or relation
vertex the point of intersection of lines or the point opposite the base of a figure
adjacent angles are a pair of angles with a common vertex and a common side, but no common interior points
hexagon a six-sided polygon
obtuse triangle a triangle that contains an obtuse interior angle
rhombus a parallelogram with four equal sides but no right angles
diameter the length of a straight line passing through the center of a circle and connecting two points on the circumference
reflection symmetry A figure has reflection (line) symmetry with respect to a line iff it coincides with its reflection image through the line
plane an unbounded two-dimensional shape
congruent angles angles that have the same measure
heptagon a seven-sided polygon
right triangle a triangle with one right angle
square (geometry) a plane rectangle with four equal sides and four right angles
congruent figures figures that have the same size and shape
rotational symmetry The ability of a figure to be rotated less than a full circle and exactly match its original image
acute angle an angle less than 90 degrees but more than 0 degrees
midpoint a point equidistant from the ends of a line or the extremities of a figure
octagon an eight-sided polygon
equilateral triangle a three-sided regular polygon
circle a round plane shape
similar figures figures that have the same shape but not the same size

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