Casaglia-Un laboratorio sulle coniche
Casaglia-Un laboratorio sulle coniche
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 />
.