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AB=a=4cm
P=1/2*a*h
6√5=1/2*4*h
h=3√5
sinα=h/BC
sinα=3√5/9
sinα=√5/3
sin²α+cos²α=1
cos²α=1-(√5/3)²
cos²α=4/9
cosα=2/3
18. 6/CB=1/2
CB=12cm
6/AC=1/√2
AC=6√2 cm
DB²+6²=12²
DB=6√3 cm
AD²+6²=(6√2)²
AD=6cm
OBw.=6√2+12+6+6√3=18+6(√2+√3) cm