AC/CB = 1/2
(AB - CB)/CB = 1/2
(36 - CB)/CB = 1/2
2(36 - CB) = CB
72 - 2CB = CB
CB + 2CB = 72
3CB = 72
CB = 72/3
CB = 24 cm
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AC/CB = 1/2
(AB - CB)/CB = 1/2
(36 - CB)/CB = 1/2
2(36 - CB) = CB
72 - 2CB = CB
CB + 2CB = 72
3CB = 72
CB = 72/3
CB = 24 cm