Find the Focus of the parabola by clicking at your guess point. Watch your SCORE!
Click again and again to locate it more precisely. Watch your score.
If you hit the focus exactly your score will jump up by 10.
Click "Show" button to see the exact location of the Focus.
Hint: Discover the unique 'focus-directrix-parabola' square.
What's the slope of the line through the vertex cutting parabola at the focus height.
"New" button - new Parabola with new Focus.