tgACD=AD:CD
tg30=AD:6sqr(3)
AD=tg30*6sqr(3)=sqr(3)/3 *6sqr(3) = 6
P=2(a+b)=2(AD+CD)=2(6+6sqr(3))=12(1+sqr(3))
tgACD=AD:CD
tg30=AD:6sqr(3)
AD=tg30*6sqr(3)=sqr(3)/3 *6sqr(3) = 6
P=2(a+b)=2(AD+CD)=2(6+6sqr(3))=12(1+sqr(3))