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<ACB = 180° - (2x-5)° = (185-2x)°
<ABC + <ACB + <BAC = 180°
(130-x)° + (185-2x)° + 45° = 180°
360° - 3x = 180°
3x = 180°
x = 60°
<ACB = (185° - 2×60°) = 185° - 120° = 65°
pelurus dari sudut C = 180° - (2x-5)° = (185-2x)°
Δ(segitiga)ABC = 180° = (130-x)° + (185-2x)° + 45°
180° = 360° - 3x
360°-180°= 3x
180°=3x
60°= x
sudut ACB = (185-2x)°
185°-(2 × 60)°
185°-120° = 65°
semoga bermanfaat yaa!! tolong tandai jawaban ini sbg yang terbaik!! thx before!! ;)