# Theorems

## Theorem 7.8 Class 9 The sum of any two sides of a triangle is greater than the third side.

Theorem 7.8 Class 9 The sum of any two sides of a triangle is greater than the third side.

## Class 9 Maths Chapter 7 Theorems Triangles

Class 9 Maths Chapter 7 Theorems Triangles Theorem 7.1 Class 9 (ASA congruence rule) Two triangles are congruent if two angles and the included side of one triangle are equal to two angles and the included side of other triangle. Theorem 7.2 Class 9 Angles opposite to equal sides of an isosceles triangle are equal.

## Theorem 6.8 Class 9 If a side of a triangle is produced, then the exterior angle so formed is equal to the sum of the two interior opposite angles.

Theorem 6.8 Class 9 If a side of a triangle is produced, then the exterior angle so formed is equal to the sum of the two interior opposite angles. Theorem 6.8 Class 9 If a side of a triangle is produced, then the exterior angle so formed is equal to the sum of the two

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