answer should work for a non-convex quadrilateral too – Discussion Forum

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Kriti

Asked: September 28, 2026In: Class 9 Maths

You have used internal angles of quadrilaterals, but they too require an exact definition, just like how we gave one for a quadrilateral. Precisely define the internal angle of a quadrilateral at a given vertex. Your answer should work for a non-convex quadrilateral too. (Hint: use the opposite vertex as well.)

At vertex V formed by adjacent rays VA and VB, the internal angle is the planar region between these rays containing the interior segment connecting V to its opposite vertex V’ near V. Cbse Class 9 Maths Ganita Manjari Part 2 ...