Miriam Bugeja
April 20, 2020
3:11 pm
This Lesson Was Contributed By:
Mathematics Department
This Lesson is For:
Lesson Duration:
80 mins.
What Should You Expect From This Lesson?
At the end of this lesson you will be able to: [1] Derive the sum of the exterior/interior angles of a polygon; [2] Calculate and use the sums of the interior and exterior angles of regular and irregular polygons.
How To Carry Out This Lesson At Home:
Lesson [1] Derive the sum of the exterior/interior angles of a polygon
Watch the following videos:
1. Sum of interior angles of polygons proof – https://www.youtube.com/watch?v=GEMzDapeg14
2. Proof of sum of exterior angles: https://www.youtube.com/watch?v=qi71nxim5s4
Suggested Practice:
SMP Interact Intermediate, Student Book pg 397 ex D no D3, D8
Lesson [2] Calculate and use the sums of the interior and exterior angles of regular and irregular polygons
Watch the following videos:
1. Regular and irregular polygons – https://www.youtube.com/watch?v=UN57vvrMrY4
2. Angles in regular polygons – https://www.youtube.com/watch?v=gVo8ZrtlSp0
3. Working with interior angles in polygons – https://www.youtube.com/watch?v=IO32ZWtEbpQ
4. Working with exterior angles in polygons – https://www.youtube.com/watch?v=-Rw3DSDfkwA
Suggested Practice:
SMP Interact Intermediate, Student Book pg 397 ex D nos D4, D5, D6, D7, D9, D10
SMP Interact Intermediate, Student Book pg 399 ex E nos E1 – E3
Angles in Polygons Worksheet (documents attached in the Resources Section)
Check your answers (document attached in the Resources Section)
Acknowledgements: Gozo College Middle and Secondary School
