returns square of distance b / w two points
def lengthSquare ( X , Y ) : NEW_LINE INDENT xDiff = X [ 0 ] - Y [ 0 ] NEW_LINE yDiff = X [ 1 ] - Y [ 1 ] NEW_LINE return xDiff * xDiff + yDiff * yDiff NEW_LINE DEDENT def printAngle ( A , B , C ) : NEW_LINE