\( \triangle \mathrm{ABC} \) is a triangle right angled at \( \mathrm{A} \) and \( \mathrm{AD} \...

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\( \triangle \mathrm{ABC} \) is a triangle right angled at \( \mathrm{A} \) and \( \mathrm{AD} \perp \mathrm{BC} \).
Then \( \frac{\mathrm{BD}}{\mathrm{DC}}= \)
- a. \( \left(\frac{\mathrm{AB}}{\mathrm{AC}}\right)^{2} \)
b. \( \frac{\mathrm{AB}}{\mathrm{AC}} \)
c. \( \left(\frac{\mathrm{AB}}{\mathrm{AD}}\right)^{2} \)
d. \( \frac{\mathrm{AB}}{\mathrm{AD}} \)
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