【动手操作】如图①,四边形是一张矩形纸片,,.先将矩形对折,使与重合,折痕为,沿剪开得到两个矩形.矩形保持不动,将矩形绕点M逆时针旋转,点N的对应点为.
【探究发现】(1)如图②),当点C与点D重合时,交于点E,交于点F.
①此时两个矩形重叠部分四边形的形状是________________;
②求的值;
(2)如图③,当点落在边上时,恰好经过点N,与交于点G,求两个矩形重叠部分四边形的面积;
【引申探究】(3)当点N'落在矩形的对角线所在的直线上时,直线与直线交于点G,请直接写出线段的长.
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2