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sudut P = 2x
sudut Q = 3x
sudut R = 48
jumlh sudut segitiga = 180 maka :
180 = sudut (P+Q+R)
180 = 2x + 3x + 48
180 = 5x + 48
5x = 180-48
x = 132/5
x = 26,4
jadi sudut P = 2 x 26,4 = 52,8 derajat
sudut Q = 3 x 26,4 = 79,2 derajat
180 = 2x + 3x + 48
180 = 5x + 48
5x = 180 - 48
5x = 132
x = 132 : 5
x = 26,4
Sehingga, besar sudut P :
( 2 × 26,4 )° = 52,8°