# NCERT Solutions for Class 9 Maths Chapter 7 Triangles The seventh chapter of NCERT Class 9 maths talks about the Triangles, its properties and inequalities. The congruence of two angles has been made simpler by the help of illustrations and examples. Various shapes such as circle and square are used to describe the congruent properties. The triangle congruence rules have been described in detail, such as the SAS congruent rule and AAS Congruence rule. The equilateral triangle, longer and smaller sides of the triangles have been further explained at the end of the chapter.

• The chapter begins with the description of the triangles, which includes also includes the properties of triangles.
• Congruent triangles form when three sides of two triangles are equivalent to fit into each other.
• The SAS Congruence rule states that two triangles are congruent only if the angle in each triangle is equal, and the sides holding these angles are also equal.
• But the ASA congruence rule is different from that of SAS Congruence angle.
• The ASA Congruence rule states that two triangles are congruent if two angles of each triangle are equal and the common side holding them is also equal.
• No two rules of congruent triangles are the same, so different equations are used to solve the problems.
• The chapter ends with various theorems used to solve different triangle problems.

 Also See NCERT Solutions For Class 9 Maths Chapter 1 Number System NCERT Solutions For Class 9 Maths Chapter 2 Polynomials NCERT Solutions For Class 9 Maths Chapter 3 Coordinate Geometry NCERT Solutions For Class 9 Maths Chapter 4 The Linear Equations in Two Variables NCERT Solutions For Class 9 Maths Chapter 5 Introduction to Euclid’s Theory NCERT Solutions For Class 9 Maths Chapter 6 Lines and Angles NCERT Solutions For Class 9 Maths Chapter 8 Quadrilaterals NCERT Solutions For Class 9 Maths Chapter 9 The Areas of Parallelograms and Triangles NCERT Solutions For Class 9 Maths Chapter 10 Circles NCERT Solutions For Class 9 Maths Chapter 11 Constructions NCERT Solutions For Class 9 Maths Chapter 12 Heron’s Formula NCERT Solutions For Class 9 Maths Chapter 13 Surface Areas and Volumes NCERT Solutions For Class 9 Maths Chapter 14 Statistics NCERT Solutions For Class 9 Maths Chapter 15 Probability

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