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sudut QPS = sudut QRS = 40
sudut PQR = sudut PSR= X
360 = (2 x 40 )+ (2 x X)
360 = 80 + 2X
360-80 = 2X
280 = 2X
X= 280/2 = 140
maka besar sudut PSR= 140 derajat