From the given set of angles write the pair of angles that are complementary to each other.

$$ 31°, 47°, 64°, 29°, 43°, 59°, 17°, 26°$$

Consider the following statements when two straight lines intersect :
i) Adjacent angles are complementary.
ii) Adjacent angles are supplementary.
iii) Vertically opposite angles are equal.
iv) Vertically opposite angles are supplementary.

If $ABC$ is a straight line then value of $x$, in the given diagram will be 

As shown in figure if $\mathrm{\angle }POR:\mathrm{\angle }ROQ=5:7$ then $\angle SOQ=\_\_\_$.

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

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, $AOB$ is a straight line and the ray $OC$ stands on it. If $\angle AOC=64°$ and $\angle BOC=x°$, find the value of $x$.

In the given figure, $AOB$ is a straight line and the rays $OC$ and $OD$ stands on it. If $\angle AOC=65°, \angle BOD=70°$ and $\angle COD = x°$, find the value of $x$.

What is the measure of a right angle? 

In the given figure, $\mathbf{\angle }1\mathbf{}$ and $\mathbf{}\mathbf{\angle }2\mathbf{}$ are supplementary angles. If $\mathit{\angle }1$ is decreased, what changes should take place in $\mathit{\angle }2$ so that both the angles still remain supplementary.