Porisma
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Conic sections

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Ellipse axes and translation

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Two panels: origin-centred ellipse with A(a,0), A′(−a,0), B(0,b), B′(0,−b); lengths 2a,2b when a>b. Translated ellipse centred at (h,k), symmetry x=h,y=k, endpoints h±a,k±b and semi-axes a,b. Numerical examples explicitly labelled.
Two panels: origin-centred ellipse with A(a,0), A′(−a,0), B(0,b), B′(0,−b); lengths 2a,2b when a>b. Translated ellipse centred at (h,k), symmetry x=h,y=k, endpoints h±a,k±b and semi-axes a,b. Numerical examples explicitly labelled.
Two panels: origin-centred ellipse with A(a,0), A′(−a,0), B(0,b), B′(0,−b); lengths 2a,2b when a>b. Translated ellipse centred at (h,k), symmetry x=h,y=k, endpoints h±a,k±b and semi-axes a,b. Numerical examples explicitly labelled.
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