Supplementary and Complementary Angles Definitions

Supplementary and Complementary Angles Definitions
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Introduction to Angles Lesson Plans

Introducing Angles

Lesson Plans by Anna Warfield

The basics of angles are so important for students to understand! Angles play a critical role in geometry and are the foundation for trigonometry and geometry. Students should eventually be able to read a protractor, but even just understanding if an angle is big (obtuse or reflex) or small (acute) makes a difference in elementary geometry. The following activities are a great way to provide visual aids to students and help them understand how different angles affect polygons.




Introducing Angles

Storyboard Description

Supplementary and Complementary Angles Worksheet

Storyboard Text

  • SUPPLEMENTARY ANGLES
  • Two angles that make a straight line together are called supplementary angles. A line, or straight angle, measures 180 degrees.
  • a
  • b
  • COMPLEMENTARY ANGLES
  • Two angles that make a right angle together are called complementary angles. A right angle measures 90 degrees.
  • g
  • h
  • a = b = __________ + __________ = __________
  • g = h = __________ + __________ = __________
  • s = t = __________ + __________ = __________
  • s
  • t
  • j = k = __________ + __________ = __________
  • j
  • k
  • q
  • r
  • x
  • y
  • q = r = __________ + __________ = __________
  • n
  • o
  • x = y = __________ + __________ = __________
  • u
  • v
  • n = o = __________ + __________ = __________
  • u = v = __________ + __________ = __________
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