Mohon bantu menemukan jawabannya

jari jari = r
jarak kedua lingkaran = j
panjang garis singgung = d

diket :
R1 = R lingkaran P = 14,5 cm
R2 = R lingkaran Q = 9,5 cm
j = 26 cm

d = √j² – (r1 + r2)² = √26²-(14,5+9,5)²= √676-(24)² = √676-576= √100 = 10 cm

BD / BD + AD = DE/AC
BD / BD + 6 = 10/15
10 (BD + 6) = 15 BD
10 BD + 60 = 15 BD
60 = 5 BD
BD = 60 : 5 = 12 cm