ÇÚÊÞÏ Çä ÇáÎãÇÓí ÇáãäÊÙã ÞíÇÓ ßá ÒÇæíÉ ãä ÒæÇíÇå 120 ÏÑÌÉ æÇáÔßá ÇáÑÈÇÚí ãÌãæÚ ÞíÇÓ ÒæÇíÇå 360 ÏÑÌÉ ÝÊßæä ÇáÞãíÉÇáãØáæÈÉ 40 ÏÑÌÉ
ÇáÔßá ÇáÎãÇÓì ÇáãäÊÙã ÞíÇÓ ßá ÒÇæíå ãä ÒæÇíÇå =108
(n-2)*180/n)
ä åì ÚÏÏ ÇáÇÖáÇÚ
æÈÇáÊÇáì ÝÇä
2x+x+108+108=360
3x+216=360
3x=144
x=48
ÇáÐíä íÔÇåÏæä ÇáãæÖæÚ ÇáÂä: 1 (0 ãä ÇáÃÚÖÇÁ æ 1 ÒÇÆÑ)
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