在平面直角坐标系xoy中,点A(0,6),点B在x轴的正半轴上.若点P,Q在线段AB上,且PQ为某个一边与x轴平行的矩形的对角线,则称这个矩形为点P,Q的“X矩形”.下图为点P,Q的“X矩形”的示意图.
(1)若点B(4,0),点C的横坐标为2,则点B,C的“X矩形”的面积为___.
(2)点M,N的“X矩形”是正方形,
①当此正方形面积为4,且点M到y轴的距离为3时,写出点B的坐标,点N的坐标.
②当此正方形的对角线长度为3,且半径为r的⊙O与它没有交点,直接写出r的取值范围___.
(1)若点B(4,0),点C的横坐标为2,则点B,C的“X矩形”的面积为___.
(2)点M,N的“X矩形”是正方形,
①当此正方形面积为4,且点M到y轴的距离为3时,写出点B的坐标,点N的坐标.
②当此正方形的对角线长度为3,且半径为r的⊙O与它没有交点,直接写出r的取值范围___.
更新时间:2019-11-04 22:56:58
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【推荐2】如图,在平面直角坐标系中,直线
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