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27 Cards in this Set

  • Front
  • Back
a part of a line that has two endpoints
line segment
lines that lie in the same plane and do not intersect; they are always the same distance apart
Parallel
lines that meet or cross at a common point
intersecting
two lines or line segments that cross or meet to form right angles
perpendicular
an angle made when two line segments meet to form a square corner; it measure 90 degrees
right angle
part of a line that starts at an endpoint and goes on forever in one direction
ray
a figure that is formed by two rays with the same endpoint
angle
points common to the sides of an angle or two sides of a polygon
vertex
an angle that measures more than 90 degrees and less than 180
obtuse angle
an angle that measures less than 90 degrees
acute angle
an angle that measures exactly 180 degrees; a straight angle forms a straight line
straight line
units for measuring angles or temperature
degrees
a device used to measure and draw angles
protractor
a simple closed plane figure made up of three or more line segments
polygon
a parallelogram with all four sides of the same length
rhombus
the line segments that make up a polygon
sides
a quadrilateral with only two parallel sides
trapezoid
a triangle that has three congruent sides
equilateral triangle
a triangle that has two congruent sides
isosceles triangle
a triangle with all sides of different lengths
scalene triangle
a triangle with one angle which measures 90 degrees
right triangle
a triangle with one obtuse angle
obtuse triangle
a triangle in which each of the three angles is acute
acute triangle
a point inside a circle at the exact middle
center
a segment that connects the center of a circle to any point on the circle
radius
a line segment that connects two points on the circle and passes through the center
diameter
a line segment that connects two points on a circle
chord