# What are the Different Types of Triangles? | Don't Memorise | Summary and Q&A

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December 18, 2014
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Infinity Learn NEET
What are the Different Types of Triangles? | Don't Memorise

## TL;DR

Triangles can be classified based on the lengths of their sides and the measures of their angles.

## Key Insights

• 🙃 Triangles can be classified based on the lengths of their sides: equilateral, isosceles, and scalene.
• 🔺 Triangles can also be classified based on the measures of their angles: acute, right, and obtuse.
• 🔺 The classification of triangles is helpful in understanding their properties and relationships.
• 🙃 Equilateral triangles have three equal sides, isosceles triangles have two equal sides, and scalene triangles have no equal sides.
• 🔺 Acute triangles have all angles less than 90 degrees, right triangles have one angle equal to 90 degrees, and obtuse triangles have one angle greater than 90 degrees.
• 🔺 The classification of triangles based on sides and angles provides a framework for further exploration in geometry.
• 🔺 Understanding triangle classification is essential for solving geometry problems and analyzing shapes.

## Transcript

How do we classify triangles? One way in which they can be classified is the lengths of their sides. Let's see how? So based on sides, the first kind of triangle is a triangle which has all its sides equal to each other. To show that they are equal. we put the same mark on each of the sides. This tells us that all three sides are equal. Such triang... Read More

### Q: What are equilateral triangles?

Equilateral triangles have all sides equal in length. The word "equi" means equal, and "lateral" means side. Therefore, equilateral triangles have three equal sides.

### Q: What are isosceles triangles?

Isosceles triangles have two sides of equal length. The third side can be any length. The two equal sides are usually marked with the same symbol or label.

### Q: What are scalene triangles?

Scalene triangles have no equal sides. Each side of a scalene triangle has a different length. The word "scalene" signifies that the sides are distinct from each other.

### Q: How are triangles classified based on angles?

Triangles can be classified as acute triangles, right triangles, and obtuse triangles based on the measures of their angles. Acute triangles have all angles less than 90 degrees, right triangles have one angle equal to 90 degrees, and obtuse triangles have one angle greater than 90 degrees.

## Summary & Key Takeaways

• Triangles can be classified based on the lengths of their sides: equilateral triangles have all sides equal, isosceles triangles have two sides equal, and scalene triangles have no sides equal.

• Triangles can also be classified based on the measures of their angles: acute triangles have all angles less than 90 degrees, right triangles have one angle equal to 90 degrees, and obtuse triangles have one angle greater than 90 degrees.

• The classification of triangles is important in geometry and helps in understanding their properties.