下面是小颖探究“关联比”与α之间的关系的思维过程,请阅读后,解答下列问题:
(1)当与为“关联等腰三角形”,且时,
①在图2中,若点E落在上,则“关联比” ;
②在图3中,探究与的关系,并求出“关联比”的值.
(2)如图4,当与为“关联等腰三角形”,且时,
①“关联比” .
②时,将绕点A顺时针旋转60°,线段扫过的面积是 .
(3)[迁移运用]如图5,与为“关联等腰三角形”.若,,点P为边上一点,且,点E为上一动点,当点E自点B运动至点P时,点D所经过的路径长为 .
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