Fill in the blanks. An ________ is the set of all points in a plane, the sum of whose distances from two distinct fixed points, called________, is constant.

' ntlfi6r fb (-q, hr,,o lr,*niu, Mgtx' &xtt \s X-aYtt r.€iro) oFy \.[_z F.ltnor Aillt is Y -q,xls b2+ c olz = bQ = A2- (1. n.rrns Er,r,rpsp Definitiont-1.. ellipsisthesetofal,loi.nPs, {r,y},suehho.t the sofn thedi.stancestweetwopo'i,ncalled,efociof thelli,psconstant....