D and E are points on the sides AB and A...

D and E are points on the sides AB and AC respectively of `Delta ABC `. In each of the following cases, determine whetheer `DE||BC` or not. (i) `AD=5.7 cm, DB =9.5 cm, Ae =4.8 cm and EC=8 cm`. (ii) `AB=11.7 cm, AC =11.2 cm , AD= 6.5cm and AE =41.2 cm`, (iii) `AB=10.8 cm, AD=6.3 cm, AC=9.6 cm and EC=4 cm`. (iv) `AD=7.2 cm AE=6.4 cm. AB =12 cm and AC=10 cm`.

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