338.In quadrilateral ABCD, P is any point in side BC. PQ || AB and PR || BD. Show that QR is parallel to AD.
Solution not provided.
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339.If D and E are respectively, the points on the sides AB and AC of a triangle ABC, such that AD = 6 cm, BD = 9 cm, AE = 8 cm and EC = 12 cm then show that DE || BC.
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340.In a ∆ABC, D and E are points on sides AB and AC respectively such that BD = CE if ∠B = ∠C, show that DE || BC.