Tolong yah pake cara !! pada gambar diatas panjang CD=

maaf yaa kalauu salahhhh....,

Dik :
AB = 28 cm
OB = 16 cm
OD = 12 cm
Dit :
CD?
28/16 = CD/12
28 × 12 = CD × 6
336 = 6CD
336/6 = CD
B. 21 cm = CD