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segitiga = 180 derajat
klau segitiga sama sisi = 180:3 = 60 derajat
sudut pusat dan sudut keliling yang menghadarp busur yang sama = sudut keliling = 1/2 sudut pusat
sudut pusat 60 derajat = 1/2 .60 derajat = 30 derajat
<p = 30 derajat