Jawablah dengan penyelesaiannya ( pake cara)

1. CE / (dibaca per ) CA = ED / AB = CD / CB
8/ 18 = 10 / AB = 6 / CB
a. 8/18 = 6 / CB
8.CB = 6 . 18
8CB = 108
CB = 108 ÷ 8
CB = 13,5
BD = CB - CD
= 13,5 - 6
= 7,5 cm
b. 8/18 = 10/ AB
8 . AB = 10 . 18
8AB = 180
AB = 180 ÷ 8
AB = 22,5