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Trójkąt AOD podobny do trójkąta AEO
OE = r
½BD/AD = OE/½AC
5/13 = r/12
13r =60
r =60/13
r =4*8/13
Odp: Promień okręgu wynosi 4*8/13
PS rysunek w zalaczniku
Zad.2
a+c=b+d
1+x =2+4
x =5
½+⅓ =x+¼
x =½+⅓-¼ =6/12 + 4/12 - 3/12
x =7/12
27+13 = 17+x
x =40 - 17
x =23
x+0,5 =0,1 +1
x =0,6