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2x + 9 +93 = 5x -3
2x + 102 = 5x - 3
105 = 3x
x = 35
a) EOC = 5x - 3
= 5 ( 35 ) -3 = 172°
b) EOA + COB = 180° - EOC
= 180° - 172 = 8°
2) A1 = 78
sudut sehadap •A1 = B1 = 78°
• A2 = B2 = 180 - 78 = 102°
• A3 = B3 = 78°
• A4 = B4 = 180-78 = 102°
sudut dalam bersebrangan
• A3 = B1 = 78°
• A4 = B2 = 102°
sudut luar bersebrangan
• A2 = B4 = 102°
• A1 = B3 = 78°
sudut dalam sepihak
• A3 + B2 = 180°
•A4 + B1 = 180°
sudut luar sepihak
• A2+B3 = 180°
• A1 + B4 = 180°
* masing masing sudutnya bisa dicari di atas,, udah sekalian tak masukin
3) B1 = 90°
B2 = 90° - 50° = 40°
B3 = 50°