# Theorems

## Theorem 6.7 Class 9 The sum of the angles of a triangle is 180º.

Theorem 6.7 Class 9 The sum of the angles of a triangle is 180º. Theorem 6.7 Class 9 The sum of the angles of a triangle is 180º. Theorem 6.7 Class 9 Class 9 Maths Chapter 6 Theorems Lines and Angles Theorem 6.1 If two lines intersect each other, then the vertically opposite angles are …

## Theorem 6.6 Class 9 Lines which are parallel to the same line are parallel to each other.

Theorem 6.6 Class 9 Lines which are parallel to the same line are parallel to each other. Theorem 6.6 Class 9 Lines which are parallel to the same line are parallel to each other. Theorem 6.6 Class 9 Class 9 Maths Chapter 6 Theorems Lines and Angles Theorem 6.1 If two lines intersect each other, …

## Theorem 6.5 Class 9 If a transversal intersects two lines such that a pair of interior angles on the same side of the transversal is supplementary, then the two lines are parallel.

Theorem 6.5 Class 9 If a transversal intersects two lines such that a pair of interior angles on the same side of the transversal is supplementary, then the two lines are parallel. Theorem 6.5 Class 9 If a transversal intersects two lines such that a pair of interior angles on the same side of the …

## Theorem 6.4 Class 9 If a transversal intersects two parallel lines, then each pair of interior angles on the same side of the transversal is supplementary.

Theorem 6.4 Class 9 If a transversal intersects two parallel lines, then each pair of interior angles on the same side of the transversal is supplementary. Theorem 6.4 Class 9 If a transversal intersects two parallel lines, then each pair of interior angles on the same side of the transversal is supplementary. Theorem 6.4 Class …

## Theorem 6.3 Class 9 If a transversal intersects two lines such that a pair of alternate interior angles is equal, then the two lines are parallel.

Theorem 6.3 Class 9 If a transversal intersects two lines such that a pair of alternate interior angles is equal, then the two lines are parallel. Theorem 6.3 Class 9 If a transversal intersects two lines such that a pair of alternate interior angles is equal, then the two lines are parallel. Theorem 6.3 Class …

## Theorem 6.2 Class 9 If a transversal intersects two parallel lines, then each pair of alternate interior angles is equal.

Theorem 6.2 Class 9 If a transversal intersects two parallel lines, then each pair of alternate interior angles is equal. Theorem 6.2 Class 9 maths If a transversal intersects two parallel lines, then each pair of alternate interior angles is equal. Theorem 6.2 Class 9 Class 9 Maths Chapter 6 Theorems Lines and Angles Theorem …

## Theorem 6.1 Class 9 If two lines intersect each other, then the vertically opposite angles are equal.

Theorem 6.1 Class 9 If two lines intersect each other, then the vertically opposite angles are equal. Theorem 6.1 Class 9 If two lines intersect each other, then the vertically opposite angles are equal. Theorem 6.1 Class 9 Class 9 Maths Chapter 6 Theorems Lines and Angles Theorem 6.1 If two lines intersect each other, …

## Class 9 Maths Chapter 6 Theorems Lines and Angles

Class 9 Maths Chapter 6 Theorems Lines and Angles Theorem 6.1 If two lines intersect each other, then the vertically opposite angles are equal. Theorem 6.2 Class 9 If a transversal intersects two parallel lines, then each pair of alternate interior angles is equal. Theorem 6.3 Class 9 If a transversal intersects two lines such …

## Class 9 Maths All Important Theorems

Class 9 Maths All Important Theorems Class 9 Maths Chapter 6 Theorems Lines and Angles Theorem 6.1 If two lines intersect each other, then the vertically opposite angles are equal. Theorem 6.2 Class 9 If a transversal intersects two parallel lines, then each pair of alternate interior angles is equal. Theorem 6.3 Class 9 If …

## Class 9 Chapter 10 Circles Theorem 10.12 : If the sum of a pair of opposite angles of a quadrilateral is 180º, the quadrilateral is cyclic.

Class 9 Chapter 10 Circles Theorem 10.12 : If the sum of a pair of opposite angles of a quadrilateral is 180º, the quadrilateral is cyclic. Class 9 Chapter 10 Circles Theorems Theorem 10.1 : Equal chords of a circle subtend equal angles at the centre. Theorem 10.2 : If the angles subtended by the …

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