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42 terms

math vocab

for the 1/21/2010 mr humphries math test
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acute angle
an angle under 90 degrees
acute triangle
a triangle with all acute angles
angle
2 rays that share a common endpoint
central angle
angle that has the center of a circle its vertex
chord
a line segment that connects 2 points on a circle
circle
a set of points in a plane equidistant from a point called the origin or the center
complementary angles
2 angles that complete a right angle
congruent
having the same measure
diagonal
a line segment that connects 2 points not already connected
diameter
a chord that goes through the origin
equilateral triangle
a triangle that has all sides congruent
isosceles triangle
a triangle that has 2 sides congruent
scalene triangle
a triangle that has no sides congruent
kite
a quadrilateral with a pair of pairs of adjacent congruent sides
line
1-D a straight path that extends infinetly in opposite directions
line segment
a part of a line or ray that extends between 2 endpoints
obtuse angle
an angle over 90 degrees
obtuse triangle
a triangle with at least 1 angle over 90 degrees
parallel lines
lines that are on the same plane and never intersect
parallelogram
a quadrilateral with a pair of pairs of parallel lines
perpendicular lines
lines that intersect at a right angle
plane
2-D, 3 points can name it and it extends infinetly in all directions
point
0-D, an exact location in space
polygon
a closed figure made of three or more line segments
radius
1/2 of a diameter
ray
has 1 endpoint and extends infinetly in the other direction
rectangle
an equiangular figure
reflection
when a figure flips across the line of reflection
regular
equilateral and equiangular
rhombus
a parallelogram,quadrilateral with all sides congruent
right angle
angle at exactly 90 degrees
right triangle
a triangle with one right angle
rotation
when a figure turns around a fixed point
sector
wedge shape created by the central angle
skew lines
non collinear lines that don't intersect
square
equilateral and equiangular polygon
straight angle
a 180 degree angle
supplementary angles
supply a straight angle
transversal lines
intersect parallel lines
trapezoid
1 paip of parallel sides
vertex
a common endpoint for 2 line segments or rays or angles etc.
vertical angles
formed by two intersecting lines and are congruent