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39 terms

math vocab

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Polygon
a closed figure with 3 or more line segments
quadrilateral
a polygon with four sides
pentagon
a polygon with five sides
angles
the figure formed by 2 rays with the same endpoint
octagon
a polygon with eight sides
decagon
a polygon with 10 sides
scalene
a shape with no congruent sides
isosceles
a shape with more than 1 congruent sides
equilateral
a polygon with all sides congruent
right
a shape or figure with a 90 degree angle
parallelogram
a quadrilateral whose opposite sides are parallel
rectangle
a parallelogram with four right angles
trapezoid
a quadrilateral with one pair of parallel sides
square
a rectangle which is equilateral
degrees
the basic unit by which angles are measured
vertex
the intersection of the two sides of an angle i
points
a dot that represents a location in a plane or space
line
a straight path of points that extend forever in opposite directions
plane
a flat surface that extends forever in all different directions
ray
part of a line that has 1 endpoint and extends forever in only 1 direction
line segment
part of a line consisting of 2 endpoints and all the points between them
congruent
shapes that are exactly the same
intersection
the set of points that are common to 2 or more lines
parallel
lines in the same place but do not intersect
vertex
the point at the corner with an angle, plane angle, or solid figure
measure
the measure of something (angle)
protractor
to use and approximate the measure of an angle
perpendicular
2 lines that meet at right angles
complementary
2 angles that if the sum of their measure is 90 degrees
supplementary
2 angles and if the sum of their measure is 180 degrees
vertical angles
angles that are formed by intersecting lines (angles across from each other)
corresponding angles
angles that are formed by intersecting lines (horizontal lines that form angles)
skew lines
in 3-D world, lines don't cross but not parallel
scalene triangle
all sides have different lengths
isosceles triangle
at least 2 sides have to be the same
equilateral triangle
all 3 sides have to be the same (60 degrees)
acute triangle
if all 3 angles are acute
obtuse triangle
if 1 of the angles are obtuse
right triangle
if one of the angles is a right angles