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< PSR = 29°
dua sudut keliling yg menghadap busur yg sama selalu sama besar.
< USR = < UTR = 47°
< PRS = < PSR = 29° (segitiga sama kaki)
jumlah sudut dalam segitiga adalah 180°
< SPR + < PRS + < PSR = 180°
< SPR = 180° - ( < PRS + < PSR)
< SPR = 180° - (29° + 29°)
= 180° - 58°
= 122°
Semoga membantu ya :)