摘要：27． 如图.已知点从出发.以1个单位长度/秒的速度沿轴向正方向运动.以为顶点作菱形.使点在第一象限内.且,以为圆心.为半径作圆．设点运动了秒.求: (1)点的坐标(用含的代数式表示), (2)当点在运动过程中.所有使与菱形的边所在直线相切的的值． 27．解:(1)过作轴于. .. .. 点的坐标为．········ (2)①当与相切时.切点为.此时. .. ．·············· ②当与.即与轴相切时.则切点为.. 过作于.则.······················································· .．················································· ③当与所在直线相切时.设切点为.交于. 则.. ．··························································· 过作轴于.则. . 化简.得. 解得. . ． 所求的值是.和．···································

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