Minta tolong gimana cara mengerjakannnya hehe :)

<p>sudut pusat = 2 × sudut keliling</p><p>∠AOC = 2 × ∠ABC</p><p>∠ABC = 60°</p><p>∠AOC = 2 × 60° = 120°</p><p>&nbsp;</p><p>Sudut refleks ∠AOC = 360° - ∠AOC</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 360° - 120°</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 240°</p><p>Jadi, jawabannya adalah (A) 240°</p>