Bantuin no 3 berdasarkan gambar besar

Penyelesaian :

45° = sudut x

30° = sudut y

x = 90° – 45°

x = 45°

y = 90° – 30°

y = 60°

Maka sudut A :

a = 180° – ( x° + y° )

a = 180° – ( 45° + 60°)

a = 180° – 105°

a = 75°

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Semoga Membantu (◕ᴗ◕✿)