Jonathan Mifsud
April 20, 2020
12:57 pm
This Lesson Was Contributed By:
The Mathematics Department
This Lesson is For:
Lesson Duration:
120 mins.
What Should You Expect From This Lesson?
In this lesson I will be able to: [1] - use the properties of triangles (equilateral, isosceles, scalene and right-angled triangles) to solve problems involving missing angles. [2] deduce that the sum of the angles of a quadrilateral is 360 ̊ and work out the size of the missing angles in quadrilaterals [3] use the properties of quadrilaterals (square, rectangles, parallelogram and trapezium) to solve problems involving missing angles.
How To Carry Out This Lesson At Home:
Lesson [1] I can use the properties of triangles (equilateral, isosceles, scalene and right-angled triangles) to solve problems involving missing angles.
Watch the following videos:
Finding missing angles in a general triangle – https://www.youtube.com/watch?v=bp5UxYKPie8
Finding missing angles in an isosceles triangle – https://www.youtube.com/watch?v=5o2TmKH-8E8
Suggested Practice:
Angles in a triangle and in a quadrilateral Worksheet Pack – Worksheet 1 (document attached in Resources Section)
Check your answers (document attached in Resources Section)
Lesson [2] I can deduce that the sum of the angles of a quadrilateral is 360 ̊ and work out the size of the missing angles in quadrilaterals.
Watch the following video: https://www.youtube.com/watch?v=6ApegKO75d0
Suggested Practice:
Angles in a triangle and in a quadrilateral Worksheet Pack – Worksheet 2 (document attached in Resources Section)
Check your answers (document attached in Resources Section)
Lesson [3] I can use the properties of quadrilaterals (square, rectangles, parallelogram and trapezium) to solve problems involving missing angles.
Watch the following videos:
Angles in a trapezium (Trapezoid):
1. https://www.youtube.com/watch?v=cAkFLU88owk
2. https://www.youtube.com/watch?v=gPiekUInV4w
3. Angles in a parallelogram:
https://www.youtube.com/watch?v=Kj1p8j-aoN0
Suggested Practice:
Angles in a triangle and in a quadrilateral Worksheet Pack – Worksheet 3 (document attached in Resources Section)
Check your answers (document attached in Resources Section)
