berarti
ADB + BAC = 180/2
2x+ 3 + x + 12 = 90
3x + 15 = 90
3x = 75
x = 25
ADB= 2x + 3 = 2(25) + 3 = 53
ACB = ADB = 53
AOB = sudut pusat = 2x ACB = 2 x 53 = 106
AOB = 2ADB
AOB = 2 (2x + 3) = 4x + 6
BOC = 2BAC
BOC = 2 (x + 12) = 2x + 24
Perhatikan bahwa AOB dan BOC saling berpelurus !
Dengan demikian, AOB + BOC = 180
4x + 6 + 2x + 24 = 180
6x + 30 = 180
6x = 180 - 30
6x = 150
AOB = 4x + 6 = 4(25) + 6 = 100 + 6 = 106
Jadi, AOB = 106 derajat ( B )
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berarti
ADB + BAC = 180/2
2x+ 3 + x + 12 = 90
3x + 15 = 90
3x = 75
x = 25
ADB= 2x + 3 = 2(25) + 3 = 53
ACB = ADB = 53
AOB = sudut pusat = 2x ACB = 2 x 53 = 106
AOB = 2ADB
AOB = 2 (2x + 3) = 4x + 6
BOC = 2BAC
BOC = 2 (x + 12) = 2x + 24
Perhatikan bahwa AOB dan BOC saling berpelurus !
Dengan demikian, AOB + BOC = 180
4x + 6 + 2x + 24 = 180
6x + 30 = 180
6x = 180 - 30
6x = 150
x = 25
AOB = 4x + 6 = 4(25) + 6 = 100 + 6 = 106
Jadi, AOB = 106 derajat ( B )