I hope I posted this in the right forum >.< ''' lol I wasnt sure where this problem would fit in?.... anyways If you can help me that would be great !

Okay so my problem is - finding the radius of rollercoasters

for example a rollercoaster travels to a hill of say 70 m then drops on a basic curve before rising again on another hill 54m high

so ther are '2 hills' one is 70m and the other 54m and a curve is in between the two hills, given this: find the radius of the curve (*** THE RADIUS ***) Thank you