<prompt> Katika takwimu, overlineDC ni sambamba na overlineAB. Tuna angle DCA 40circ na angle ABC 73circ. Tafuta angle ACB.asyjozi A,B,C,D;A 0,0;B 1,0;D -0.1,0.6;C 0.8,0.6;chora-0.2,0--1.2,0;chora-0.2,0.6--1.2,0.6;choraA--C--B;leboA,A,S;leboB,B,S;leboC,C,N;leboD,D,N;nukta A; nukta B; nukta C; nukta D;asy  <response>: Kwa kuwa overlineABparalleloverlineDC, angle ABC angle BCD 180circ, hivyo angle BCD 180circ - 73circ 107 mduara . angle ACB pembe ACD pembe BCD, hivyo angle ACB 107circ - 40circ 67circ. 