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angle Two rays that have the same endpoint.
vertex The common endpoint of the two rays in an angle.
protractor An instrument used to and draw angles.
acute angle An angle whose measure is between 0º and 90º.
right angle An angle whose measure is 90º.
obtuse angle An angle whose measure is between 90º and 180º.
straight angle An angle measuring 180º.
line A straight path of points that goes on forever in two directions.
ray Part of a line that has one endpoint and extends forever in one direction.
parallel lines In a plane, lines that never cross and stay the same distance apart.
intersecting lines Lines that pass through the same point.
perpendicular lines .Two lines that intersect to form square corners or right angles
point An exact location in space.
line segment Part of a line having two endpoints.
degrees (º) A unit of measure for angles and temperature.
polygon A closed plane figure made op of line segments.
regular polygon A polygon that has sides of equal length and angles of equal measures.
triangle A polygon with 3 sides.
quadrilateral A polygon with 4 sides.
pentagon A polygon with 5 sides.
hexagon A polygon with 6 sides.
octagon A polygon with 8 sides.
equilateral triangle A triangle whose sides all have the same length.
isosceles triangle A triangle with two sides of the same length.
scalene triangle A triangle in which no sides have the same length.
right triangle A triangle in which one angle is a right angle.
acute triangle A triangle whose angles are all acute angles.
parallelogram A quadrilateral with both pairs of opposite sides parallel.
trapezoid A quadrilateral that has exactly one pair of parallel sides.
rectangle A parallelogram with four right angles.
rhombus A parallelogram with all sides of the same length.
square A rectangle with all sides the same length.
generalization A general statement. Example: A generalization about rectangles applies to all rectangles.
Created by: 17egardn