Angles, lines and polygons



  • A right angle is 90 degrees and is represented by a square angle notation. Acute angles are less than 90 degrees and obtuse angles are greater than 90 degrees but more than 180 degrees.
  • Straight lines are equal to 180 degrees.
  • Reflex angles are greater than 180 degrees but less than 360 degrees.
  • Angles around a point or in a circle add up to 360 degrees.

Angles in parallel lines:

  • Parallel lines are always the same distance apart and never meet.
  • When a pair of parallel lines is cut with another line, known as an intersecting transversal, pairs of angles with special properties are created:

- Angles that make F shapes are corresponding angles and are equal.

- Angles that make Z shapes are alternate angles and are equal.

- Angles


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