1. IDENTIFYING TRIANGLES
They are everywhere.

2. IDENTIFY TRIANGLES
By sides
By angles
The symbol for triangles is

3. Isosceles Triangle
At least two sides are congruent.

4. Equilateral Triangle
All sides are congruent.

5. Scalene Triangle
No sides are congruent

6. Right Triangle
Exactly 1 right angle

7. Acute triangle
All the angles are acute angles.

8. Obtuse triangle
Exactly 1 angle is obtuse.

9. Identifying Triangles

10. Perimeter of a triangle
The sum of all the side lengths
3cm cm
4cm
P=3+3+4=10cm

11. Angle sum
With any triangle all the angles add up to 180°!

12. Let’s identify triangles!
The following slides will show some triangles used in every day situations.
On your own paper, identify each triangle using sides, angles or both.