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Ray A part of a line that has one endpoint and extends without end in one direction.
angle A figure formed by two rays or line segments with a common endpoint
line A straight path that goes on forever in opposite directions
perpendicular Lines,line segments, or rays are perpendicular if they form right angles
parallel The same distant apart at every point
oblique Lines that are not parallel or perpendicular
intersect To cut or divide by passing through or across
protractor A tool used to measure angles
degree A unit for measuring angles also a unit measuring temperature
right angle An angle that measures 90 degrees
straight angle An angle of 180 degrees
supplementary angles Angles have a sum of 180 degrees
complementary angles angles having a sum of 90 degrees
Vertical angles pairs of opposite formed by intersecting lines
opposite angles when two lines intersect
polygon A closed figure with sides made of straight line segments
congruent exactly the same size and shape
isosceles triangle a triangle with at least two congruent sides
equilateral triangle having all equal sides
scalene triangle A triangle with no equal sides is a scalene triangle
acute triangle a triangle with three acute angles
obtuse angle a triangle with one obtuse angle
right triangle a triangle with one right angle
right trapezoid a trapezoid with least one right angle
circle A plane figure that forms a closed path so that all the points on the path are the same distance from a point called the center
reflex circle an angle greater than 180 degrees
Created by: 10020355