(1)【理解运用】如图2,在中,为边上一点,点、点关于直线对称,连接并延长至点判断点是否为点,关于直线的“等角点”,并说明理由;
(2)【拓展提升】如图2,在(1)的条件,若,,点是射线上一点,且点,关于直线的“等角点”为点,请在图2中画出点,判断的形状,并说明理由;
(3)【拓展提升】如图3,在中,,的平分线交于点,点到的距离为2,直线垂直平分边,点为点,关于直线“等角点”,连接,,当时,的值为 .
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