с=x+y=4h h^2=x*y 0.5*a*b=0.5*c*h a*b=4h*h
x=b*cos(a) y=a*sin(a)
h^2=a*sin(a)*b*cos(a)
h^2=4h*h*sin(a)*cos(a)
1=2*sin(2a)
a=30/2=15
с=x+y=4h h^2=x*y 0.5*a*b=0.5*c*h a*b=4h*h
x=b*cos(a) y=a*sin(a)
h^2=a*sin(a)*b*cos(a)
h^2=4h*h*sin(a)*cos(a)
1=2*sin(2a)
a=30/2=15