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WHAT IS A TRIANGLE?

• Has 3 sides�• Has 3 vertices�• Has 3 interior angles�• The sum of the interior angles is always 180°

• A triangle is a polygon with three sides, three vertices, and three angles.

Key Facts

TYPES OF TRIANGLES BASED ON SIDES

Triangles can be classified according to the lengths of their sides. There are three types:

• Equilateral Triangle
• Isosceles Triangle
• Scalene Triangle

EQUILATERAL TRIANGLE

• An equilateral triangle has three equal sides and three equal angles. Each angle measures 60°.

ISOSCELES TRIANGLE

• An isosceles triangle has two equal sides and two equal angles.

SCALENE TRIANGLE

• A scalene triangle has all sides of different lengths and all angles of different measures.

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Types of Triangles

In a glance :

QUIZ

1. Which triangle has three equal sides?
2. Which triangle has two equal sides?
3. Which triangle has no equal sides?
4. Which triangle has three lines of symmetry?
5. Which triangle has no line of symmetry?

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https://www.youtube.com/watch?v=oQeK4LyKLHw

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