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[tex] \frac{\ \textless \ A0B}{\ \textless \ BOC} [/tex] = [tex] \frac{Pb AB}{Pb BC} [/tex]
[tex] \frac{45}{72} [/tex] = [tex] \frac{Pb AB}{35} [/tex]
[tex] \frac{5}{8} [/tex] = [tex] \frac{Pb AB}{35} [/tex]
Pb AB . 8 = 32 . 5
Pb AB . 8 = 160
Pb AB      = [tex] \frac{160}{8} [/tex]
Pb AB      = 20 cm