tolong di bantu.....makasih

CE/CB = ED/AB
18/30 = 6/y
3/5 = 6/y
1/5 = 2/y
10 = y

x = 21/x = 18/12
x . 18 = 21 . 12
X = 252 / 18
x = 14cm

y= 18/(18+12) = 6/y
18/30 = 6/y
18. Y = 30.6
y = 180 / 18 atau 30.6/18 (tinggal dibagi ( dicoret)
y= 10cm