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Chapter 8-5th Grade
Shapes
Question | Answer |
---|---|
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. |