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(menghadap busur yang sama)
ABC = 90 karena menghadap ke diameter
atau
APB = sudut pusat = 2 x sudut keliling = 2 x 62 = 124
karena segitiga APB sama kakai maka ABP = BAP = 1/2 (180 - 124)
= 1/2 (56)
= 28
Maka, ABC = 180 - 62 - 28 = 90