(1)【动手证明】如图1:四边形的两条对角线,交于点,若,求证:;
(2)【尝试应用】如图2,在中,,,,分别以,为边向外作两个等腰直角三角形和,使得,连接,求的长;
(3)【拓展提高】如图3,四边形是菱形,对角线,交于点,点是和的中点,点是和的中点,连接,并延长交于点.若,求菱形的周长.
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