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Syllabus

$\angle $ABD = x$\xb0$, $\angle $BDC =y$\xb0$ and $\angle $ACD = z$\xb0$, find the values of x, y, z.

Solve this :12. In the figure, prove that :

$\angle \mathrm{A}+\angle \mathrm{B}+\angle \mathrm{C}+\angle \mathrm{D}+\angle \mathrm{E}+\angle \mathrm{F}=360\xb0$

8. What is the difference between parallel lines and perpendicular lines. Give each.

9. Match the following

i) Straight angle a) Less than one-fourth of the revolution.

ii) Right angle b) More than half a revolution.

iii) Acute angle c) Half of a revolution.

iv) Obtuse angle d) one - fourth of a revolution.

v) Reflex angle e) Between $\frac{1}{4}and\frac{1}{2}$ of a revolution.

f) One complete revolution