<prompt> Katika mchoro ulioonyeshwa, overrightarrowOAperpoverrightarrowOC na overrightarrowOBperpoverrightarrowOD. Ikiwa angleAOD ni mara 3.5 angleBOC, angleAOD ni nini? asyukubwa wa kitengo 1.5cm;defaultpenlinewidth.7ptfontsize10pt;dotfactor4;jozi O0,0, Adir0, Bdir50, Cdir90, Ddir140;jozi nuktaO,A,B,C,D;nukta dots;kuchoraO--1.2D,EndArrow4;kuchoraO--1.2B,EndArrow4;kuchoraO--1.2C,EndArrow4;kuchoraO--1.2A,EndArrow4;leboD,D,SW;leboC,C,W;leboB,B,E;leboA,A,N;leboO,O,S;asy  <response>: Acha x ionyeshe kipimo katika digrii za angle BOC. Kwa sababu angle BOD na angle COA ni pembe za kulia, angle COD na angle BOA kila hupima digrii 90-x. Kwa hivyo angle AODx90-x90-x digrii. Kutatua 3.5xx90-x90-xtunapata x1804.540. Kwa hivyo angle AOD180circ-40circ140text digrii. 