tolong dibantu ya beserta caranya..terimakasih

Kelas 8 Matematika
Bab Kesebangunan

CP/CA = 4/(4 + 6)
CP/CA = 4/10
CP/CA = 2/5

PQ/AB = 2/5
CQ/CB = 2/5
PR/PB = 2/5

PR/RB = 2/5
PR/(PR + RB) = 2/5
2/(2 + RB) = 2/5
2 + RB = 5
RB = 5 - 2
RB = 3

PR : PB = 2 : 3