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3x -6 + 4x + 25 = 180 derajat
7x = 180 + 6 - 25
x = 161 ÷ 7
x = 23
pelurus AOC = sudut COB
= 4x + 25
= 4(23) + 25
= 92 + 25
= 117 derajat
=3x+4x =180+6-25
=7x =161
=7x:7 =161:7
=x =23
sudut AOC=3x-6=3(23)-6=63