(1)如图1,点是边上一点,连接,将绕点逆时针旋转至,连接.若,,求的面积;
(2)如图2,连接,将绕点顺时针旋转至,连接,取的中点,连接.试探究线段,,之间的数量关系;
(3)如图3,连接,为上一点,在的上方以为边作等边,刚好点是点关于直线的对称点,连接,当取最小值的条件下,点是直线上一点,连接,将沿所在直线翻折得到(与在同一平面内),连接,当取最小值时,请直接写出的值.
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