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keliling 1/4 = 1/2 r
luas 1/2 = 1/2 r²
keliling 1/2 = r
rumus keliling 1/4 lingkaran: 1/4.2.pi.r
rumus luas 1/2 lingkaran: 1/2.pi.r kuadrat
rumus keliling 1/2 lingkaran: 1/2.2.pi.r