(1)如图1,点是矩形边的中点,过点画矩形的一条对称轴交于;
(2)如图2,△ABC和△DEF的顶点分别与小正方形的顶点重合,若△DEF是△ABC绕点O旋转得到的,请在图中画出旋转中心;
(3)如图3,圆经过两个格点,以及格线上的点,作劣弧的中点;并在优弧上找一点,使得;
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