# Types of triangles based on angles

A triangle can be drawn with different measures of angles which also determine the kind of triangle formed.

### Objectives

Recognize the triangles based on the measures of the sides

20 minutes

### Prerequisites/Instructions, prior preparations, if any

Prior knowledge of point, lines, angles, elements of triangle

### Process (How to do the activity)

• Identify the angle types in the triangle.
• Can the angles in the triangle be of different type – obtuse or right angle.
• Establish the types of triangles based on the types of angles that form the triangle – when all angles are acute angles, when one of the angle is a right angle and when one of the angle is obtuse angle.
• Is it possible to have a triangle with two right angle or two obtuse angle. Why or why not?
• What kind of a triangle is formed when all the angles are equal? For what measure of the angle such a triangle is formed?
• Can a triangle be formed with a reflex angle.
• Measure the angles for different triangle, recognize the types of angles and conclude the type of triangle.
Observation Angle 1 measure and

its Type

Angle 2 measure and

its Type

Angle 3 measure and

its Type

What can you say about angles? Type of triangle formed
Triangle 1
Triangle 2
Triangle 3

Evaluation at the end of the activity

• Are children able to recognize the types of triangles based on the angles in a triangle.