# Types of triangles based on sides

From Karnataka Open Educational Resources

A triangle can be drawn with different measures of sides and these sides determine the kind of triangle formed.

### Objectives

Recognize the triangles based on the measures of the sides

### Estimated Time

30 minutes

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

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

### Materials/ Resources needed

- Digital : Computer, geogebra application, projector.
- Non digital : Worksheet and pencil.
- Geogebra files : “
**Types of triangle by sides.ggb**”

Download this geogebra file from this link.

### Process (How to do the activity)

- Students should recognize the elements of a triangle – sides and angles.
- What are the measures of the sides of a triangle, are the measurements of the sides equal or different.
- Establish that different triangles are formed with the different measures of the sides: when all sides are different, when any two sides are equal and when all sides are equal.
- Children can note the measures of the sides in the worksheet for different triangles to conclude the type of triangles based on the sides.
- Is the triangle formed for any measure of the sides. When does the triangle not form. What is the relation between the 3 sides for the triangle to be formed.

Observation | Side 1 | Side 2 | Side 3 | What can you say about sides? | 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 when the sides are specified.
- Have children been able to conclude when a triangle is formed given the three sides.