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<BOC = 360 - <AOD - <BOD - <AOC = 360 - 150 - 85 - 80 = 45
<ODC = < OCD = (180 - <COD)/2 = (180 - 130)/2 = 25
< OAB = <OBA = (180 - BOA)/2 = (180 - 125)/2 = 27.5'
Maka <AEC = 180 - <OCD - <OBA = 180 - 27,5 - 25 = 137,5
2.
K. = πd = 3,14 x 10 = 31,4
Maka panjang busur lingkaran = 72/360 x 31,4 = 6,28