Find the value of $m$ if the points $(5, 1), (2, 3)$ and $(8, 2m )$ are collinear.

Find the perimeter of the triangle formed by the points $(3, 5), (4, 8)$ and $(5, 6)$.

If area of a triangle is $35$ square units with vertices $\left( {2, - 6} \right),\,\,\left( {5,\,\,4} \right)$ and $({k},\,\,4)$ then ${k}$ is :

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