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142° + 48° + 2X° = 360°
2X = 360° - (142° + 48°)
2X° = 360° - 190°
2X° = 170°
X = 170 :2
X= 85.
b ) Jumlah semua sudut = 360°
120° + 30° + 90° + 3X° = 360°
3X° = 360° - (120° + 30° + 90°)
3X° = 360° - 240°
3X° = 120°
X = 120° : 3
X = 40.
c) Jumlah sudut = 180° (karena membentuk garis lurus)
145° + X° = 180°
X° = 180° - 145°
X° = 35°
d) Jumlah sudut 180°
55° + 50° + X° = 180°
X° = 180° - (55° + 50°)
X° = 180°- 105°
X° = 75°.
e) Jumlah sudut 180°
X° + 70 + 90° = 180°
X° = 180° - (70° + 90°)
X° = 180° - 140°
X° = 40°
Jika kamu suka, tolong beri ucapan terima kasih yah.