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70+a= 3x+25
3x-a=70-25=45=<PQR
<PRQ= 180-70-45= 65derajat
maaf kalau salah
Sudut QRT = 3x + 15 = 180
3x = 180 - 15
3x = 165
x = 165 : 3
x = 55
jawaban:
Sudut PRQ = 180 - 55 = 125 derajat
maaf kalau ada yang salah, semoga membantu☺