(1)如图1,他先在边OA和OB上分别取,再移动角尺使,然后他就说射线OP是的角平分线.试根据小新的做法证明射线OP是的角平分线;
(2)如图2,将角尺绕点P旋转了一定的角度后,,但仍然出现了,此时OP是的角平分线吗?如果是,请说明理由.
(3)如图3,在(2)的基础上,若角尺旋转后恰好使得,请判断线段OD与OE的数量关系,并说明理由.
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