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Verified answer
Seluruh sudut segitiga berjumlah 180°sudut PSR = 140° dan sudut SPR = 30°
180° = 140° + 30° + sudut PRQ
180° = 170° + sudut PRQ
sudut PRQ = 180° - 170°
= 10°
<SRQ + 140 + 60 + 140 = 360
<SRQ + 340 = 360
<SRQ = 360 - 340
<SRQ = 20
<PRQ = 1/2 (< SRQ) = 1/2 (20) = 10