a circle of radius 1 is placed on an incline where point P , a point on the circle , has the coordinates (-5,-5). the circle is rolled up the inline, and once the circle hits the origin, the circle is then rolled horizontally along the x-axis to the right. What is the x-coordinate of the point where P touched the incline or the x-axis for the fifth time.
能告诉我到底这道题是什么意思吗？我看着觉得特别扭...
谢谢啦
