Lesson Plan of Describe different types of Angles
Students` Learning Outcomes
- Describe adjacent, complementary and supplementary angles.
Information for Teachers
- Students already know about angles.
- Adjacent Angles: two angles with common vertex, one common arm and uncommon interior are called Adjacent Angles.
- Angles x and y are adjacent because they share a ray [line in red] and a vertex [point in black called D]
- Complementary Angles: two angles whose sum of measures is 900 are called Complementary angles.
- Complementary may or may not be adjacent.
- If the angles are not adjacent, still they can be called complementary angles, as given below are complementary angles because the sum of their measures is 900.
- For example the following pairs of non-adjacent angles are also complementary as their sum is equal 900 degrees.
- Supplementary Angles: two adjacent or non-adjacent angles are Supplementary if their sum is equal to 1800 degrees.
- Examples:
- 400and 1400 are supplementary angles of each other.
- 930and 870 are supplementary angles of each other.
- The following pairs of non-adjacent angles are also supplementary angles as their sum is equal to 1800.
- Consult textbook at all the steps wherever required.
Material / Resources
Writing board, chalk / marker, duster, textbook
Introduction
- Ask the students to look for following words in English dictionary [this can be given as home work one day before]
- Adjacent, complementary and supplementary
- Inquire the meanings and then introduce one by one.
Development
Activity 1
- Activities for Adjacent Angles;
- Supplementary Angles:
- Ask students to draw a straight line in the notebooks. Take any point on the line and draw another line to form any angle. [Show figure]
- Ask them to measure the angles on both sides and add the degrees of both.
- Raise your hands if you get 1800 as the sum [they all will raise as they finish measurements]
- Tell them that these angles are called supplementary angles.
- Also introduce that supplementary angles are not necessary adjacent. Ask children to make / find some supplementary angles.
Activity 2
- Complementary Angles:
- Ask the students to first draw a right angle and then draw a line starting from its vertex cutting through the right angle making another angle.
- Ask them to measure both the angles and add the degrees and then introduce the term complementary angles.
- Divide the students in groups and ask them to think about the definitions discussed.
- Ask “can we consider following as examples of Supplementary angles, if yes then why?” There are Adjacent angles of a four-cornered room.
- Adjacent angles of a window; Time of 6:00 with the second hand pointed at 3,
- Two adjacent ends of a piece of papers.
- Ask “can we considered following as examples of Complementary angles, if yes then why.
- Adjacent angles of a four-cornered room
- Adjacent angles of a window
- Time of 6:00 with the second hand pointed at 3
- Two adjacent ends of a piece of paper
- Ask ‘can we consider following as examples of Complementary angles, if yes then why?
- Examples of Complementary angles:
- Time of 3:00 with the second hand pointed at 2.
- Wind up the lesson by inviting students one by one in front of class to repeat verbally.
Sum up / Conclusion
- Review new learning with the students.
- Ask them to define the following:
- Adjacent Angles: two angles with common vertex, one common arm and uncommon interior are called Adjacent Angles.
- Complementary Angles: two angles whose sum of measures is 900are called Complementary Angles.
- Supplementary Angles: two angles are supplementary if they add up to 1800 degrees.
Assessment
- Feedback of students on related examples of activities will help to assess them.
- Draw different angles on the board as given in examples and ask them to identify pairs with respect to complementary, supplementary and adjacent.
Follow up
- Encourage students to look for angles in the corners of roofs and walls and other places and report back to class.
