Name the angle, vertex and the sides in the following figure.

  

The wheels of a car are of diameter $80 \mathrm{c}\mathrm{m}$ each. How many complete revolutions does each wheel make in 10 minutes when the car is traveling at a speed of $66 \mathrm{k}\mathrm{m}$ per hour? $\left(\mathrm{use} \pi =\frac{22}{7}\right)$

Only one circle can be drawn through three non collinear points.

In the given figure, $AB\parallel CD, \angle ABO=40°$ and $\angle CDO=35°$. Then the value of $x$ will be

In the given figure, list the points which are in the interior of $\angle AOB$

In the given figure, write another name for $\angle 1$.

Investigate.
In the given figure, the angle measures $30°$. Look at the same figure through a magnifying glass.
Does the angle become larger? Does the size of the angle change?

How many angles are formed in the figure given below? Name them.