Assertion: cartesian coordinate | /r/HasProperty | such that f
Facets:
Source sentences:
text: If one introduces Cartesian coordinates, such that F = ( 0 , f ) , f > 0 , {\displaystyle F=(0,f),\ f>0,} and the directrix has the equation y = − f {\displaystyle y=-f} , one obtains for a point P = ( x , y ) {