Lines and Angles. Mathematics CBSE, Class 9: lessons, tests, tasks.

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1.	Basic terms and definitions, and axioms on pair of angles
2.	Theorem supporting vertically opposite angles
3.	Axioms supporting parallel lines and a transversal
4.	Theorems supporting parallel lines and a transversal
5.	Theorem supporting lines parallel to the same line
6.	Theorems supporting angle sum property of a triangle

1.	Choose the correct statements Difficulty: easy	3
2.	Find the unknown angle Difficulty: easy	2
3.	Find the unknown Difficulty: medium	4
4.	Find the value of the unknown variable Difficulty: medium	1
5.	Find the angle Difficulty: medium	3
6.	Find the value of a, b, and c Difficulty: medium	3
7.	Find the value of 'p' Difficulty: medium	5
8.	Find the angles in the triangle Difficulty: medium	3
9.	Find the required angle of the triangle Difficulty: medium	3
10.	Find the specified angles Difficulty: hard	5
11.	Find angle 'OPQ' Difficulty: hard	5

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Training test

Difficulty: medium

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Methodical recommendation

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