The area of the triangle whose co-ordinates are $(2012, 7), (2014, 7)$ and $(2014, a)$ is $1 \,sq$ unit. The sum of possible values of $a$ is

The area of the triangle formed by the lines $x=0;y=0$ and $x\sin { { 18 }^{ 0 } } +y\cos { { 36 }^{ 0 } } +1=0$ is-

If $P , Q$ are two points on the line $3 x + 4 y + 15 = 0$ such that $O P = O Q = 9$ then the area of $\Delta O P Q$ is

A line L passes through the points $(1,1)$and $(2,0)$ and another line $L^{\prime}$ passes through $\left(\frac{1}{2}, 0\right)$ and perpendicular to L.Then the area of the triangle formed by

the lines $L, L^{\prime}$ and $y-$ axis, is