Mathematics (2019) Grade(s): 4

MA19.4.28

Identify two-dimensional figures based on the presence or absence of parallel or perpendicular lines or the presence or absence of angles of a specified size.

Unpacked Content

Knowledge

Students know:
  • Two lines are parallel if they never intersect and are an equal distance apart.
  • Two lines are perpendicular if they are at right angles to each other.
  • A right triangle is a triangle that has one right angle.

Skills

Students are able to:
  • Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines.
  • Classify two-dimensional figures based on the presence or absence of angles of a specified size.
  • Identify right triangles.

Understanding

Students understand that:
  • shapes are categorized based on attributes they possess in common such as angle size, side length, side relationships (parallel and perpendicular).

Vocabulary

  • Two-dimensional figure
  • Parallel lines
  • Perpendicular lines
  • Angle
  • Right triangle
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