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= 1/2×82
= 41
adc + aoc = 41+41
= 82 (c)
< AOC = 82' (sudut pusat lingkaran)
Dit: < ADC + < ABC....?
< ADC dan < ABC adalah sudut keliling lingkaran.
Besar sudut keliling adalah setengah sudut pusat yg menghadap busur yg sama. maka:
< ADC + < ABC = 1/2x82 + 1/2x82
= 41 + 41
= 82' (jawab C)