en عمومى General پژوهشي Research paper <br> <div style="text-align: left;"></div> An $(n, r)$-arc is a set of $n$ points of a projective plane such that some $r$, but no $r+1$ of them, are collinear. The maximum size of an $(n, r)$-arc in&nbsp; $PG(2, q)$ is denoted by $m_r(2,q)$.&nbsp; In this paper we present&nbsp; a new $(184,12)$-arc in PG$(2,17),$&nbsp; a new $(244,14)$-arc and a new $(267,15$)-arc in $PG(2,19).$ Finite projective plane, $(n,r)$-arc in a projective plane, $(l,t)$-blocking set in a projective plane, Maximum size of an $(n,r)$-arc, Linear codes. 125 133 http://ijmsi.ir/browse.php?a_code=A-10-3680-1&slc_lang=en&sid=1 R. Daskalov daskalovrn@gmail.com 10031947532846009223 10031947532846009223 Yes Department of Mathematics and Informatics, Technical University of Gabrovo, Bulgaria