tolong bantuin dong!please A,B,C dan D

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4x4= 16
3x3= 9
16+9= akar 25
25= 5
bc
6:2=bc:3=  ( dikali silang)
18=2bc=
bc= 18: 2= 9

bd
ab:ad=ac:ae
5+x:5=6:2
10+2x=30
2x=30-10
x=20:2= 10 db= 5
keliling abc= 
10+9+6= 25