In an equilateral \( \mathrm{ABC} \), if \( \mathrm{AD} \perp \mathrm{BC} \), then \( \mathrm{AD... VIDEO
In an equilateral \( \mathrm{ABC} \), if \( \mathrm{AD} \perp \mathrm{BC} \), then \( \mathrm{AD}^{2}= \)
a. \( \mathrm{CD}^{2} \)
b. \( 2 \mathrm{CD}^{2} \)
c. \( 3 \mathrm{CD}^{2} \)
d. \( 4 \mathrm{CD}^{2} \)
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