Nomor 24 caranya bagaimana.

9×14:6=3×7=21 ini kalau gk salah

EF = DB = 9 cm

9/(AD + DB) = CF/(CF + FB)
9/(AD + 9) = 6/(6 + 14)
9/(AD + 9) = 6/20
6(AD + 9) = 20 × 9
AD + 9 = 180/6
AD + 9 = 30
AD = 30 - 9
AD = 21 cm