HSC Tips - Conics (1 Viewer)

[ninetypercent]

- use angle in semi-circle to prove points are concyclic
- similar triangles for some length questions
- PS/PM = e. May come in handy
- know distance formula, midpoint formula, gradient, etc
- draw a diagram!

coroneos supplement is nasty in conics

 

[jet]

Whenever a focal distance is involved, always always always refer back to the focus-directrix definition: PS = ePM.

 

[kdizzler]

Thanks

 

[iSplicer]

Whenever a focal distance is involved, always always always refer back to the focus-directrix definition: PS = ePM.

This. This this this this this!

Another invaluable idea: if you find yourself using the distance formula, stop and think. Please.

 

[SpiralFlex]

Angle bisector theorem.

 

[lolcakes52]

If using the distance from the foci definition of the ellipse or hyperbola and the eccentricity is 1, the locus is the interval of a straight line and not a circle!