misalkan O merupakan titik pusat
<BOD = 2 <BCD = 2y
<BOD refleks = 2 <BAD = 2x
2x + 2y = 360°
2(x+y) = 360°
x+y = 360°÷2
x+y = 180°
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misalkan O merupakan titik pusat
<BOD = 2 <BCD = 2y
<BOD refleks = 2 <BAD = 2x
2x + 2y = 360°
2(x+y) = 360°
x+y = 360°÷2
x+y = 180°