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< PRQ + < RPQ + < RQP = 180°
< PRQ + 110° + 30° = 180°
< PRQ = 180° - 110° - 30°
< PRQ = 40°
garis bagi RS membagi < PRQ menjadi 2 sama besar, maka
< PRS = < QRS = 40°/2 = 20°
jumlah sudut dlm segitiga 180° (segitiga PSR)
< PSR + < PRS + < RPS = 180°
< PSR + 20° + 110° = 180°
< PSR = 180° - 20° - 110°
< PSR = 50°
Semoga membantu ya :)