哈哈,我最爱数学了~ 首先,second quadrant x-axis -(sq rt 3) [不会打根号..不好意思],y-axis 1, thus radius of the semi-circle is 2, and the angle opposite to 1 is 30 degrees...hence we know the angle from the positive side of x-axis to the line (which is the radius=2) we want to know is 60 degrees... therefore, (1, sqrt 3) s=1
哈哈,我最爱数学了~ 首先,second quadrant x-axis -(sq rt 3) [不会打根号..不好意思],y-axis 1, thus radius of the semi-circle is 2, and the angle opposite to 1 is 30 degrees...hence we know the angle from the positive side of x-axis to the line (which is the radius=2) we want to know is 60 degrees... therefore, (1, sqrt 3) s=1