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## TRIANGLES AND TYPES OF TRIANGLES

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**What is a TRIANGLE ?**• A closed figure formed by joining three line segments is called a TRIANGLE .**TYPES OF TRIANGLES**Two Ways • On the basis of angles • On the basis of sides**On the basis of ANGLES**Three types • Acute angled triangle • Right angled triangle • Obtuse angled triangle**Acute angled triangle**• A triangle whose all the angles are acute is called an ACUTE ANGLED TRIANGLE .**Right angled triangle**• A triangle in which one of the angle is right angle is called RIGHT ANGLED TRIANGLE.**Obtused angled triangle**• A triangle in which one of the angle is obtuse angle is called OBTUSED ANGLED TRIANGLE .**On the basis of sides**Three types • Equilateral triangle • Isosceles triangle • Scalene triangle**Equilateral triangle**• A triangle whose all the sides are of equal length is called equilateral triangle.**Isosceles triangle**• A triangle whose any two sides are of equal measure is called scalene triangle.**Scalene triangle**• A triangle whose no two sides are of equal measure is called scalene triangle.**Recap**• A closed figure formed by joining three non collinear points is called • A triangle whose all the sides are of equal length is called • A triangle whose no two sides are of equal length is called • A triangle whose one angle is 90 degree is called • A triangle whose all the angles are less than 90 degree is called