(1)若修建的斜坡BE的坡角(即∠BAC)不大于45°,则平台DE的长最多为 米;
(2)一座建筑物GH距离坡脚A点27米远(即AG=27米),小明在D点测得建筑物顶部H的仰角(即∠HDM)为30°.点B、C、A、G、H在同一个平面上,点C、A、G在同一条直线上,且HG⊥CG,问建筑物GH高为多少米.
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