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GAOKAO · Conic Sections · Standard

Conic Sections: Ellipse math: eccentricity math with math: math?

Ellipse, hyperbola, parabola standard forms.

Try the problem

Ellipse

\dfrac{x^2}{25}+\dfrac{y^2}{9}=1

: eccentricity

e=c/a

with

c=4

:

e

?

Hint and answer

Concept to use

Focus-directrix.

Hint

c^2=a^2-b^2

.

Answer

4/5

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