(1)如图,,过点作于点,过点作于点.由,得.又,可以推理得到.进而得到_____________,.我们把这个数学模型称为“字”模型或“一线三等角”模型;
(模型应用)
(2)如图,,连接,且于点与直线交于点.求证:点是的中点;
(深入探究)
(3)如图,已知四边形和为正方形,的面积为的面积为,则有_____________(填“>、、”)
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