图(1),在和中,,,,连接,交于点M.
①的值为______;②的度数为_______.
(2)类比探究
图(2),在和中,,,连接,交的延长线于点M,请计算的值及的度数;
(3)拓展延伸
在(2)的条件下,若,,将绕点O在平面内旋转一周.
①当直线经过点B且点C在线段上时,求的长;
②请直接写出运动过程中M点到直线距离的最大值.
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