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Figure: http://img838.imageshack.us/img838/9551/38768603.png In the figure, OPQRS is a sector of a circle. If arc PQ = arc QR = arc RS, then B = A. 105 B. 120 C. 135 D. 144 E. 150

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In thefigure,OPQRS is a sector of a circle.If arc PQ= arcQR=arcRS then B =A:105,B:120,C:135,D:144,E:150 SolPR,SQ相交於Barc PQ= arcQR=arcRS=90度/3=30度∠RBS=(arc PQ+arcRS)/2=30度∠B=180度-30度=150度(E)

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