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K = πd
= 22/7 . 28
= 88 cm
sdt pusat = 22/88 . 360
= 90⁰
b. keliling = 2*π*r
2 * 22/7 * 14
2 * 22 * 2
88 cm
c. sudut pusat. 22 cm = X/360 × 22/7 × 14 × 2
22 cm = X/360 × 88
22 × 360 / 88 = X
90 derajat = X