Question
If in ΔABC, DE || BC, AB = 7.5 cm BD = 6 cm and DE = 2 cm then the length of BC in cm is:
Answer: Option C
$$\eqalign{
& \vartriangle ADE \simeq \vartriangle ABC \cr
& \frac{{AD}}{{AB}} = \frac{{DE}}{{BC}} \cr
& \frac{{1.5}}{{7.5}} = \frac{2}{{BC}} \cr
& BC = 10\,{\text{cm}} \cr} $$
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$$\eqalign{
& \vartriangle ADE \simeq \vartriangle ABC \cr
& \frac{{AD}}{{AB}} = \frac{{DE}}{{BC}} \cr
& \frac{{1.5}}{{7.5}} = \frac{2}{{BC}} \cr
& BC = 10\,{\text{cm}} \cr} $$
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