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3x + 2x + 4x = 180 + 19 - 10
3x + 2x + 4x = 189
9x = 189
x = 21
Sudut₁ = 3x = 3 × 21 = 63°
Sudut₂ = 2x - 19 = 2 × 21 - 19= 23°
Sudut₃ = 4x + 10 = 4x + 10 = 94°
90 = 9x - 9
189 = 9x
x = 21
besar sudutnya
1. 3x = 63
2. 4x +10= 94
3. 2x-19 = 23