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4b I feel like I'm Doing something wrong I'm getting 128, the answer is 16?
My working:
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Can't quite follow all of your working. I understand the use of 4a = length of latus rectum, but I don't understand how you found the area of the parabolic cross section to use as the volume of your slice.
Hi! Do we need to know the condition of the focal chord for conics? Or is that only needed in 3u parametrics? Thank you
Parabola: The tangents at the end of a focal chord intersect at right angles on the directrix
Ellipse/Hyperbola: The tangents at the end of a focal chord intersect on the directrix.
So simply put, if the chord is a chord of contact from the directrix, it is focal.