
Know
hyperbola. Show its directrixs,
asymptotes and e. F_{1} and F2 are focus. 

Circle C pass through point A(0,p),
p>0. The center of the circle is C. C moves in curve x^{2}=2py.
MN is the chord of C cut by X axis. Dynamically show the length
of MN. 

Know a circle passes
point A(12,3),and its tangent line is straight line 4x+3y26=0,
tangent point is (5,2).Find the circle equation. 

Ellipse
,
its focuses are F1 and F2, P is point which
can be moved on ellipse. When <F1PF2 is obtuse angle, calculate
the field of P in axis.



