Jawabanmu

2014-09-03T20:27:16+07:00
OC/OA = OD/OB
x/4 = 10/8

Dibuat perkalian silang..

10*4 = x*8
40 = 8x
x = 40/8
x = 5

Maka panjang OC = 5
8 3 8