In the figure above, what is the value of 2s-r?[img]2011q3/ct_egmatqj_egmatqchoo

游客2025-02-27 22

问题 In the figure above, what is the value of 2s-r?

选项 A、60
B、70
C、100
D、140
E、220

答案 E

解析 Since 4r and 5r form a straight line, which is 180 degrees, 4r+5r=180. When we simplify that to 9r=180, we can solve to get r=20. Therefore 5r=100, and s-20=100. So we can tell that s=120. Using those numbers, the equation 2s-r becomes 2(120)-20, which equals 220.

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