Two points on opposite sides of a tower or below an observer: width = h(cot a + cot b)

1. A.
   $100\sqrt{3}$ m
2. B.
   $75\sqrt{3}$ m
3. C.
   $\frac{100\sqrt{3}}{3}$ m
4. D.
   $60\sqrt{3}$ m

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1. A.
   $\frac{\tan \alpha + \tan \beta}{\tan \alpha \tan \beta}$
2. B.
   $\frac{\tan \alpha \tan \beta}{\tan \alpha + \tan \beta}$
3. C.
   $\frac{\cot \alpha \cot \beta}{\cot \alpha + \cot \beta}$
4. D.
   $\frac{\cot \alpha + \cot \beta}{\cot \alpha \cot \beta}$

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1. A.
   $\theta<30^\circ$
2. B.
   $30^\circ<\theta<45^\circ$
3. C.
   $45^\circ<\theta<60^\circ$
4. D.
   $60^\circ<\theta<90^\circ$

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1. A.
   $2h(\tan\alpha + \cot\alpha)$
2. B.
   $H \tan\alpha \cdot \tan\beta$
3. C.
   $h \cot\alpha \cdot \cot\beta$
4. D.
   $h \sec\alpha \cdot \mathrm{cosec}\,\alpha$

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1. A.
   220 m
2. B.
   225 m
3. C.
   230 m
4. D.
   235 m

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