Theorem 6.7 Class 9 Maths
Statement: The sum of the angles of a triangle is 180ยบ.
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Theorem 6.6 Class 9 Maths
Statement: Lines which are parallel to the same line are parallel to each other.
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Statement: 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.
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Statement: If a transversal intersects two lines such that a pair of alternate interior angles is equal, then the two lines are parallel.
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