(1)由坡度与坡角的关系是i=tanα得α=arctani=arctan2/19≈6°
由sinβ=4.2/7.5=0.56得β=arcsin0.56≈34°
(2)AE=4.2m*9.5=39.9m
AB=√(AE²+BE²)=40.1m
FD=√(CD²-CF²)=6.1m
AD=AE+EF+FD=39.9m+2.8m+6.1m=48.8m
(1)由坡度与坡角的关系是i=tanα得α=arctani=arctan2/19≈6°
由sinβ=4.2/7.5=0.56得β=arcsin0.56≈34°
(2)AE=4.2m*9.5=39.9m
AB=√(AE²+BE²)=40.1m
FD=√(CD²-CF²)=6.1m
AD=AE+EF+FD=39.9m+2.8m+6.1m=48.8m