If AB ∥ DC, ABCD cannot be non-convex because consecutive interior angles sum to 180°, preventing reflex angles. If AB = CD or ∠A = ∠C, it can be non-convex, such as in an arrowhead shape. Class 9 Ganita Manjari Part ...
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If AB ∥ DC, ABCD cannot be non-convex because consecutive interior angles sum to 180°, preventing reflex angles. If AB = CD or ∠A = ∠C, it can be non-convex, such as in an arrowhead shape. Class 9 Ganita Manjari Part ...