If D (3, -1), E (2, 6) and F (5, 7) are the vettices of the sides of $\Delta DEF$, the area of triangle DEF is sq. units.

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

$x=a \ldots . .(1), y=b$…………..(2), $y=m x$……………(3)

এবং $2 y-y=3$……………(4) চারটি সরলরেখার সমীকরণ।

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