jawaban ya kakak kakak !

Sudut POR=360°-(Sudut SOR+Sudut POQ+Sudut QOS)
Sudut POR=360°-(65°+125°+50°)
=360°-240°
= 120°
Sudut PTR =180-[( 1/2×Sudut POR)+(1/2×(180-Sudut SOR))+(1/2×(180-Sudut POQ))]
= 180-[(1/2×120)+(1/2×(180-65))+(1/2×
(180-125))]
= 180-[60+(1/2×115)+(1/2×55)
= 180 - (60+57,5+27,5)
=180 - 145
=35
Jadi sudut PTR adalah 35° (C)