<prompt> Katika mchoro, AB na CD ni mistari iliyonyooka. Thamani ya x ni nini? asychora0,0--12,0;chora0,5--12,5;chora3,0--5,5--9,0;lebo60circ,5,4.5,W;lebo50circ,5.5,4.5,E;leboA,0,5,W;leboC,0,0,W;leboB,12,5,E;leboD,12,0,E;lebo120circ,3,0,NW;leboxcirc,7.5,0,N;asy  <response>: asychora0,0--12,0;chora0,5--12,5;chora3,0--5,5--9,0;lebo60circ,5,4.5,W;lebo50circ,5.5,4.5,E;leboA,0,5,W;leboC,0,0,W;leboB,12,5,E;leboD,12,0,E;lebo120circ,3,0,NW;leboxcirc,7.5,0,N;leboX,5,5,N;leboY,3,0,S;leboZ,9,0,S;asy Kwa kuwa angle AXB 180circ, kisha angle YXZ 180circ - 60circ - 50circ 70circ. Pia, angle XYZ 180circ - angle CYX 180circ - 120circ 60circ. Kwa kuwa pembe katika pembetatu XYZ zinaongeza hadi 180circ, kisha x circ 180circ - 70circ - 60circ 50circ, hivyo x50. 