1. A
   $a = b + c$
2. B
   $b = c + a$
3. C
   $c = a + b$
4. D
   $b = c$

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1. A
   25 m
2. B
   $25\sqrt{3}$ m
3. C
   50 m
4. D
   $50\sqrt{3}$ m

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1. A
   $\dfrac{(p+q)\sin\alpha}{p-q}$
2. B
   $\dfrac{p\sin\alpha}{p+q}$
3. C
   $\dfrac{p\sin\alpha}{p-q}$
4. D
   $\dfrac{(p-q)\sin\alpha}{p+q}$

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1. A
   1 and 3 only
2. B
   2 and 3 only
3. C
   1 and 2 only
4. D
   1, 2 and 3

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1. A
   right-angled
2. B
   equilateral
3. C
   isosceles
4. D
   obtuse-angled

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1. A
   $\pi/4$
2. B
   $\pi/2$
3. C
   $\pi/3$
4. D
   $\pi/6$

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1. A
   $\frac{r\sin\beta}{\sin(\alpha/2)}$
2. B
   $\frac{r\sin\beta}{\sin(\alpha/4)}$
3. C
   $\frac{r\sin(\beta/2)}{\sin\alpha}$
4. D
   $\frac{r\sin\alpha}{\sin(\beta/2)}$

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1. A
   $2h$
2. B
   $\frac{3h}{2}$
3. C
   $h$
4. D
   $\frac{h}{2}$

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1. A
   $1:2:3$
2. B
   $3:2:1$
3. C
   $1:\sqrt{3}:2$
4. D
   $1:\sqrt{3}:\sqrt{2}$

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1. A
   $h^2(\cot^2 y-\cot^2 x)=z^2$
2. B
   $z^2(\cot^2 y-\cot^2 x)=h^2$
3. C
   $h^2(\tan^2 y-\tan^2 x)=z^2$
4. D
   $z^2(\tan^2 y-\tan^2 x)=h^2$

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1. A
   9 m
2. B
   10·5 m
3. C
   13·5 m
4. D
   15 m

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1. A
   30°
2. B
   45°
3. C
   60°
4. D
   75°

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1. A
   $\dfrac{a^{2}-b^{2}}{ab}$
2. B
   $\dfrac{a^{2}}{bc}$
3. C
   $\dfrac{b^{2}}{ca}$
4. D
   $\dfrac{c^{2}}{ab}$

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1. A
   12 m
2. B
   9 m
3. C
   $(6+\sqrt{3})$ m
4. D
   $(6+3\sqrt{3})$ m

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1. A
   45°
2. B
   60°
3. C
   75°
4. D
   90°

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1. A
   16 cm$^2$
2. B
   12 cm$^2$
3. C
   10 cm$^2$
4. D
   8 cm$^2$

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1. A
   $h\cos\theta$
2. B
   $h\sin\theta$
3. C
   $h\cos2\theta$
4. D
   $h\sin2\theta$

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1. A
   $\frac{7}{128}$
2. B
   $\frac{11}{128}$
3. C
   $\frac{7}{64}$
4. D
   $\frac{11}{64}$

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