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36 terms

Geometery Vocab, Chapter 6, Grade 5

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point
A fixed location in space.
line
A straight path that continues without end in both directions.
line segment
Part of a line between two endpoints.
ray
Part of a line that has one endpoint and goes on without end in one direction.
intersecting lines
Lines which cross each other, meeting at common point.
perpendicular lines
Intersecting lines that form right angles.
parallel lines
Lines in the same plane which do not intersect.
plane
A flat surface that extends without end in all directions.
right angle
An angle measuring 90 degrees.
acute angle
An angle measuring less than 90 degrees.
straight angle
An angle of 180 degrees.
obtuse angle
An angle measuring greater than 90 degrees but less than 180 degrees.
vertex
The endpoint at which two rays intersect.
protractor
An instrument that is used for constructing and measuring angles.
equilateral triangle
A triangle with tree sides of equal length.
isosceles triangle
A triangel with at least two sides of equal length.
scalene triangle
A triangle having three unequal sides.
right triangle
A triangle having one 90 degree angle.
acute triangle
A triangle having three acute angles.
obtuse triangle
A triangle having one angle greater than 90 degrees.
polygon
A closed plane figure formed by line segments.
regular polygon
Has sides that are equal in length and angles that are equal in size.
quadrilateral
A polygon with four sides.
polyhedron
A solid figure having only flat surfaces called faces.
circle
A closed plane figure with all points an equal distance from the center.
compass
A tool used to draw a circle.
diameter
A line segment crossing the center of a circle and having both endpoints on the circle.
radius
A line segment from the center to a point on the circle.
chord
A line segment with both endpoints on the circle.
line symmetry
A line (or fold) that divides a figure into congruent halves.
asymmetry
No lines of symmetry exist.
translation (slide)
It moves the figure in a straight line, changing its location, but not its position.
reflection (flip)
A move that turns the figure over on a line of symmetry.
rotation (turn)
It moves the figure around a fixed point.
congruent figures
Figures that have the same shape and size.
similar figures
Figures that have the same shape but may not have the same size.