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Casaglia-Un laboratorio sulle coniche

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Luoghi geometrici<br />

PF<br />

Poiché = e si ha:<br />

Pd<br />

PF = e ! Pd.<br />

PF '<br />

Ma anche = e e quindi:<br />

Pd '<br />

Quindi:<br />

cioè:<br />

PF '= e ! Pd '<br />

( Pd + Pd ')<br />

'<br />

PF + PF '= e = eDD<br />

PF +<br />

PF '= cost<br />

.<br />

.

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