How would I curve a ramp so that the object would travel the longest distance?

I know the optimal angel to launch on object is around 45 degrees, not taking into account air resistance etc.

But if I am to use a curved ramp, how would I curve the ramp so that the object would travel the longest distance? I heard something about making sure the tangent of the tip of the ramp is at 45 degrees, but I could be wrong.

Any ideas are welcome.

Thanks

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