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mikecampbellashleyca
18.12.2020 •
Mathematics
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Ответ:
Ответ:
Step-by-step explanation:
Let the green point on the parabola be P.
Let the focus of the parabola be F.
Let M be the point on the directrix where the perpendicular from P intersects.
We know that for a conic, and for a parabola, e = 1.
So,
FP = PM
It is given that the distance between the green point and the focus is 9.
That is, FP = 9.
So, PM = 9.
Hence, the distance between the green point and the directrix = 9