tg(a)=BH/AH =>AH=BH/tg(a) =>AH=4/tg(a)
tg(бета)=BH/HC => HC=BH/tg(бета) => HC=4/tg(бета)
AC=AH+HC = 4/tg(a)+4/tg(бета) =4*(1/tg(a)+1/tg(бета))
tg(a)=BH/AH =>AH=BH/tg(a) =>AH=4/tg(a)
tg(бета)=BH/HC => HC=BH/tg(бета) => HC=4/tg(бета)
AC=AH+HC = 4/tg(a)+4/tg(бета) =4*(1/tg(a)+1/tg(бета))