HI Prashant Kumar,
$$x^2=20$$ can be written as $$x^{2\ }-20=0$$

=> $$\left(x+2\sqrt{\ 5}\right)\left(x-2\sqrt{\ 5}\right)=0$$

They are the equations of a pair of straight lines.

Parabolas are of the form y=$$ax^2+bx+c$$ or x=$$ay^2+by+c$$

I hope this helps!

Hi Akhil,
The sides are immaterial.
You can take any one of the 3 sides as base and arrive at the same solution. 
Since the median cuts the triangles in the ratio 2:1, 
the remaining side is always 2/3rd of total area of triangle.
Hope this helps:)

Thanks

Np!