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The height of a tower is $20$ m. The length of its shadow made on the level ground when the Sun's altitude is $60^\circ$, is:
- (a)$\frac{20}{\sqrt{3}}$ m
- (b)$20\sqrt{3}$ m
- (c)$\frac{20}{3}$ m
- (d)$20$ m
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(a) $\frac{20}{\sqrt{3}}$ m