解答我的數學

1. 120+140+a=360( <s at a pt)
a=360-260
a=(calculate yourself)
2.60+50+y= 180(adj <s on a straight line)
y= 180-110
y=(calculate yourself)
3. x=115( opp <s)
115+y=180( corr <s AB// CD)
y=180-115
y= (calculate yourself)

hope that helps , the reason i didn't give the answer to u is that i dont know to just give everything to u,, becoz that is copying.. but i hope u are not just copying everything down, i hope u do understand it be4 you copy it. coz copying is no good. you need to know why.

1.a=360-120-140=100(圓心角)
2.y=180-60-50=70(直線上的鄰角)
3.x=115(對頂角)


希望幫到你
圖片參考：http://imgcld.yimg.com/8/n/HA00796854/o/701101090109413873438210.jpg