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Examples
Example 2 Important
Example 3 Important
Example 4 Deleted for CBSE Board 2023 Exams
Example 5 Deleted for CBSE Board 2023 Exams
Example 6 Important Deleted for CBSE Board 2023 Exams
Example 7 Deleted for CBSE Board 2023 Exams
Example 8 Important Deleted for CBSE Board 2023 Exams
Last updated at Dec. 8, 2016 by Teachoo
Maths Crash Course - Live lectures + all videos + Real time Doubt solving!
Example 1 In Fig, lines PQ and RS intersect each other at point O. If ∠ POR : ∠ ROQ = 5 : 7, find all the angles. Given ∠ POR : ∠ ROQ = 5 : 7 Let ∠ POR = 5x & ∠ ROQ = 7x, where x is some number Now, ∠ POR +∠ ROQ = 180° 5x + 7x = 180° 12x = 180° x = (180° )/12 x = 15° ∠ POR = 5x ∠ ROQ = 7x Since PQ and RS are two lines intersecting each other, we apply vertically opposite angle theorem to it ∠ POS = ∠ ROQ = 105° and ∠ SOQ = ∠ POR = 75 °