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4th Grade Geometry DCA Vocabulary

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  • an exact location in space
    point
  • rectangle (tell me about the sides and angles)
    opposite sides are parallel and equal and has 4 right angles
  • Line Segment
    part of a line that consists of two points called endpoints and all points between them
  • rhombus (tell me about the sides and angles)
    4 sides of equal length, 2 acute and 2 obtuse angles
  • obtuse angle
    Measures greater than 90, less than 180
  • right angle
    measures exactly 90 degrees
  • right triangle
    one right angle and 2 acute angles
  • scalene triangle
    no sides of equal length
  • parallelogram (tell me about the sides and angles)
    2 pairs of parallel sides, 2 acute and 2 obtuse angles
  • What is a line?
    straight path that extends in two opposite directions without end
  • trapezoid
    exactly 1 pair of parallel sides
  • acute triangle
    a triangle with 3 acute angles
  • Ray
    part of a line that consists of one endpoint and all the points of the line on one side of the endpoint
  • obtuse triangle
    a triangle with one obtuse angle and 2 acute angles
  • acute angle
    Measures greater than 0, less than 90
  • intersecting lines
    Lines that cross each other at exactly one point
  • isosceles triangle
    It has 2 sides of equal length.
  • equilateral triangle
    It has 3 sides of equal length.
  • perpendicular lines
    Lines that intersect to form right angles
  • square (tell me about the sides and angles)
    4 sides of equal length and 4 right angles
  • parallel lines
    Lines that never intersect and are always the same distance apart