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# Chapter 8-5th Grade

### Shapes

point An exact location in space.
line A straight path of points that goes on forever in two directions.
plane An endless flat surface.
line segment A part of a line with two endpoints.
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 Intersecting lines that intersect to form square corners or right angles.
angle Two rays that have the same endpoint.
Vertex The common endpoint of the two rays in an angle.
degree (°) A unit of measure for angles.
protractor An instrument used to measure and draw angles.
right angle An angle whose measure is 90°.
acute angle An angle whose measure is between 0° and 90°.
straight angle An angle measuring 180°.
obtuse angle An angle whose measure is between 90° and 180°.
regular polygon A polygon that has sides of equal length and angles of equal measure.
polygon A closed plane fi gure made up of line segments.
quadrilateral A polygon with 4 sides.
triangle A polygon with 3 sides.
hexagon A polygon with 6 sides.
pentagon A polygon with 5 sides.
equilateral triangle A triangle whose sides all have the same length.
octagon A polygon with 8 sides.
Created by: rhondacarlton