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4th Grade Geometry DCA Vocabulary

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    Basic geometry definitions
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  • What is a line?
    straight path that extends in two opposite directions without end
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  • Line Segment
    part of a line that consists of two points called endpoints and all points between them
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  • Ray
    part of a line that consists of one endpoint and all the points of the line on one side of the endpoint
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  • an exact location in space
    point
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  • parallel lines
    Lines that never intersect and are always the same distance apart
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  • intersecting lines
    Lines that cross each other at exactly one point
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  • perpendicular lines
    Lines that intersect to form right angles
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  • acute angle
    Measures greater than 0, less than 90
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  • obtuse angle
    Measures greater than 90, less than 180
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  • right angle
    measures exactly 90 degrees
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  • acute triangle
    a triangle with 3 acute angles
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  • obtuse triangle
    a triangle with one obtuse angle and 2 acute angles
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  • right triangle
    one right angle and 2 acute angles
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  • equilateral triangle
    It has 3 sides of equal length.
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  • isosceles triangle
    It has 2 sides of equal length.
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  • scalene triangle
    no sides of equal length
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