Move points A,B,C to create a parabola (quadratic function) that closely matches the bird's flight path. Extrapolate to determine whether the bird will hit a pig or not.
Next problem: http://www.geogebratube.org/student/m6968 Based on Sweeney Math's "Angry Birds Geogebra" http://sweeneymath.blogspot.ca/2011/02/angry-birds-geogebra.html