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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
