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trus, kan jmlh sudut segitiga 180°
jadi masukkin angkanya
8x+3+16y+19+30 = 180
8x+16x+22 = 150
8x+16x = 128
(8x+16x = 128) / 8
x+2y = 16° (D)
10.
sudut RQS = 180-4x
sudut QSR = 180-5x
180-4x+180-5x+81 = 180
360-9x = 99
360-99 = 9x
261 = 9x
x = 29
tinggal masukkin ke sudut TSP dulu = 5x
= 5.29=145°
jdi sudut QSR nya 180 - 145 = 35°(B)