bantuin nomer 28 pliss..

Bab Kesebangunan

CD/CB = CE/CA
12/(12 + p) = 9/(9 + 3)
12/(12 + p) = 9/12
12/(12 + p) = 3/4
4 × 12 = 3(12 + p)
48 = 36 + 3p
3p = 48 - 36
p = 12/3
p = 4 cm