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= 180-4x-25
= 155-4x
3x+2x+155-4x = 180°
155+x = 180
x = 180-155
x = 25°
Sudut P = 3x = 75°
Sudut R = 2x = 50
Sudut Q = 155-4x = 155-100 = 55°
2x + 3x - 4x = 25
x = 25
⇒ ∠PRQ = 2x = 2 (25)
= 50
∠RPQ = 3x = 3 (25)
= 75
⇒ ∠PRQ + ∠RPQ =
50 + 75 = 125
⇒∠PQR = 180 - ∠PRQ + ∠RPQ
= 180 - 125
= 55 °
Jadi, Jawabannya yang B