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Kita mencari nilai X terlebih dahulu
2x+3x = 90°
5x = 90°
x = 18°
Besar Sudut A = 90
Besar sudut B = 2(18)
= 36
Besar sudut C = 3(18)
= 54
Besar sudut ABC = 90+ 36 + 54
= 180°