T=2*v*sin(alpha)/g
L=t*v*cos(alpha)=v^2/g*sin(2*alpha)
H=g*(t/2)^2/2=g*(v*sin(alpha)/g)^2/2=v^2/g*sin^2(alpha)/2
по условию H/L=n=11
v^2/g*sin^2(alpha)/2 : v^2/g*sin(2*alpha) = n
sin^2(alpha)/2 : 2*sin(alpha)*cos(alpha) = n
sin(alpha)/2 : 2*cos(alpha) = n
tg(alpha) = n*4
alpha = arctg(n*4)= arctg(11*4)= arctg(44) =
1,548073 рад =
88,69805
град