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When a triangle is not a right angle triangle and Pythagoras fails.
Right Angled Triangle: Find Angles - Trigonometry - VividMath.com
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Trig Ratios: Find an Angle (Right Angled Triangle) - VividMath.com
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Concept of Right angled Triangles - Geometry - Maths - Class 7/VII - ISCE,CBSE - NCERT
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When To Use Cosine Rule - VividMath.com
Key Skill - Labelling Sides of a Right-Angled Triangle
