The figure below shows an equilateral triangle bounded by two straight lines.

What is the sum of four marked angles?

In the figure below $J$ is meeting junction of three straight roads, $R1, R2, R3$. A car upon reaching junction $J$, the car turned right and entered into road $R3$.

By what angle did the car turn at junction $\mathrm{J}$?

Below is the picture of Incheon Bridge, New Songdo City, South Korea, designed using cables. The angles between the vertical pole $QT$ with each cable are equal $\left(\angle PQT=\angle RQT\right)$. The sum of angles each cable making with road is$70°$ $\left(\angle PQU+\angle RQS=70°\right)$

What is the angle that the cable $PQ$ is making with the road, $QU$?

In the following figure, which of the following statements must be true?
(i) $a+b=d+c$
(ii) $a+c+e=180°$
(iii) $b+f=c+e$

In the adjoining figure, two plane mirrors $I$ and $II$ are placed perpendicular to each other. $PM$ and $QN$ are perpendiculars to the mirrors $I$ and $II$ respectively. If an incident ray strikes the mirror $I$ at $P$ and the reflected ray strikes the mirror$II$ at $Q$, then the value of $x$ is

In the adjoining figure, two plane mirrors $I$ and $II$ are placed parallel to each other. $AM$ and $BN$ are perpendiculars to the mirrors $I$ and $II$ respectively. If an incident ray strikes the mirror $I$ at $A$ and the reflected ray strikes the mirror$II$ at $B$, then the value of $x$ is

In the adjoining figure, $AB\parallel CD$. The value of $x$ which will make $EF\parallel CD$ is

In the adjoining figure, $AB\parallel CD\parallel EF$ and $PQ\parallel RS$. If $\angle CQP=60°$ and $\angle RDQ=25°$, then $\angle QRS$ is equal to

In the adjoining figure, if $l\parallel m$, then the value of $x$ is