no 20 tolong yaaaaaa

Kelas 7 Matematika
Bab Garis dan Sudut

Sudut AOB + sudut BOC + sudut COD = 180°
2x + 15° + 6x + 5x - 30° = 180°
13x = 180° + 15°
x = 195°/13
x = 15°

Sudut AOC
= 2x + 15° + 6x
= 8x + 15°
= 8 . 15° + 15°
= 120° + 15°
= 135°

Jawabannya A

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