探究发现
(1)△BCD与△ACE是否全等?若全等,加以证明;若不全等,请说明理由.
拓展运用
(2)若B、C、E三点不在一条直线上,∠ADC=30°,AD=3,CD=2,求BD的长.
(3)若B、C、E三点在一条直线上(如图2),且△ABC和△DCE的边长分别为1和2,求△ACD的面积及AD的长.
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