jika panjang QS=6 cm, QR=15 cm, dan TS = 10 cm, panjang PQ?tulis rumus yaa... mohon bantuan dan caranya

10/a = 15/(a+6)
10 × (a+6) = 15 × a
10a + 60 = 15a
60 = 15a-10a
60 = 5a
60/5 = a
12 = a (PS)

PQ? PQ = PS+SQ
PQ = 12+6
PQ = 18 (A.)