Class 9 | Chapter 8 | Quadrilaterals | Theorem 8.1
Theorem 8.1: A diagonal of a parallelogram divides it into two congruent triangles. Home Theorem 8.2
Read MoreClass 9 | Chapter 7 | Triangles | Theorem 7.8
Theorem 7.8: The sum of any two sides of a triangle is greater than the third side. Theorem 7.7 Class 9 | Home
Read MoreClass 9 | Chapter 7 | Triangles | Theorem 7.7
Theorem 7.7: In any triangle, the side opposite to the larger (greater) angle is longer. Theorem 7.6 Theorem 7.8
Read MoreClass 9 | Chapter 7 | Triangles | Theorem 7.6
Theorem 7.6: If two sides of a triangle are unequal, the angle opposite to the longer side is larger (or greater). Theorem 7.5 Theorem 7.7
Read MoreClass 9 | Chapter 7 | Triangles | Theorem 7.5
Theorem 7.5: (RHS congruence rule) : If in two right triangles the hypotenuse and one side of one triangle are equal to the hypotenuse and one side of the other triangle, then the two triangles are congruent. Theorem 7.4 Theorem…
Read MoreClass 9 | Chapter 7 | Triangles | Theorem 7.4
Theorem 7.4: (SSS congruence rule) If three sides of one triangle are equal to the three sides of another triangle, then the two triangles are congruent. Theorem 7.3 Theorem 7.5
Read MoreClass 9 | Chapter 7 | Triangles | Theorem 7.3
Theorem 7.3: The sides opposite to equal angles of a triangle are equal Theorem 7.2 Theorem 7.4
Read MoreClass 9 | Chapter 7 | Triangles | Theorem 7.2 | Isosceles triangle theorem
Theorem 7.2: Angles opposite to equal sides of an isosceles triangle are equal. Theorem 7.1 Theorem 7.3 Prerequisite It is quite easy to prove this theorem and it’s been proved by two different ways in the above tutorial: Using angle…
Read MoreClass 9 | Chapter 7 | Triangles | Theorem 7.1
Theorem 7.1: (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. Home Theorem 7.2
Read More