This document provides an overview of triangles, detailing the properties of their angles and sides, and explains how to classify them into categories like acute, right, obtuse, scalene, isosceles, and equilateral triangles. It includes examples of calculating missing angles and naming triangles based on their characteristics. Additionally, the document contains interactive elements for learners to answer questions related to the material.

1. Triangles
Amnah Albuloushi

2. Triangle
● A triangle is a figure that has 3 sides and 3
angles. The sum of the measure of the angles is
180°
● m<1 + m<2 + m<3 = 180°
1
2
3

3. Find the missing angle measure
<1 = 50° <2= 75° <3 = ?
○ 55°
○ 95°
○ 50°

4. Correct!!
○ Good Job! You correctly answered the
question!

5. Incorrect
○ You did not answer the question correctly.
Lets review the material.

6. Triangle
● A triangle is a figure that has 3 sides and 3
angles. The sum of the measure of the angles is
180°
● m<1 + m<2 + m<3 = 180°
1
2
3
Correct answer

7. Find the missing angle measure
○ <1 = 50° <2= 75° <3 = ?
○ 50 + 75 = 125
○ 180 – 125 = 55°

8. ○ Classify Triangles Using Angles
○ Acute Triangle
○ Right Triangle
○ Obtuse Triangle
○ Classify Triangles Using Sides
○ Scalene Triangle
○ Isosceles Triangle
○ Equilateral Triangle
How can we Classify Triangles !

9. Classify Triangles Using Angles
○ Acute Triangle
○ Properties: All acute angles.

10. Classify Triangles Using Angles
○ Right Triangle
○ Properties: 1 right angle.

11. Classify Triangles Using Angles
○ Obtuse Triangle
○ Properties: 1 obtuse angle.

12. Classify Triangles Using Sides
○ Scalene Triangle
○ Properties: No congruent sides.

13. Classify Triangles Using Sides
○ Isosceles Triangle
○ Properties: At least 2 congruent sides.
This symbol represents
that the sides are
congruent.

14. Classify Triangles Using Sides
○ Equilateral Triangle
○ Properties: 3 congruent sides.

15. Naming Triangles
○ Triangles have a 2 part name.
○ The first part of the name, names the angles
(acute, obtuse, or right)
○ The second part of the name, names the sides
(scalene, isosceles, or equilateral)
○ Example: Obtuse Scalene

16. Name the Triangle
○ The type of this triangle is Acute Scalene
○ TRUE
○ FALSE

17. Correct!!
○ Good Job! You correctly answered the
question!

18. Incorrect
○ You did not answer the question correctly.
Lets review the material.

19. Classify Triangles Using Angles
○ Acute Triangle
○ Properties: All acute angles.

20. Name the Triangle
○ Fill in the blank with the correct answer
…………
○ Acute Equilateral
○ Right Scalene

21. Correct!!
○ Good Job! You correctly answered the
question!

22. Incorrect
○ You did not answer the question correctly. try
again.

23. Congratulations!
○ Good job!
○ You have completed the lesson on triangles!