We get the co-ordinates of a projectile
at t1, (a,b)
at t2 (c,d)
at t3, (e,f)
and so on as required.
Write a program in C++ to calculate equation of trajectory of projectile..

Hi PratyushTheGreat, welcome at DaniWeb!
What you need is linear regression for quadratic curve fitting (The trajecory of a projectile is parabolic.)
The link has an explanation and code in C#, but it should be fairly easy to google something in C++ I guess.

I think you will have to specify angle of projection too

I don't think so. It is the other way around! Once you have calculated the equation(3 points is the absolute minimum here) you could calculate that angle if you wanted to.

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