Theorem 6.2 - Theorem 6.8 chapter 6 can study by students of class 9. These definitiona and formulas of Class 9 Maths Chapter 6: Lines and Angles is developed and witten by our expert teachers. Maths formulas. Theorem 6.2 - Theorem 6.8 is prepapred and collected from varius resources to help the students.
Theorem 6.2 : If a transversal intersects two parallel lines, then each pair of alternate interior angles is equal.
Theorem 6.4 : If a transversal intersects two parallel lines, then each pair of interior angles on the same side of the transversal is supplementary.
Theorem 6.5 : 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 6.6 : Lines which are parallel to the same line are parallel to each other.
Theorem 6.7 : The sum of the angles of a triangle is 180ยบ.
Theorem 6.8 : 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.
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