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no 4 keliling sebuah seperempat lingkaran = 1/4.2.phi.r =
1/4.2.3,14.10cm = 1/2.31,4 = 15,7cm
no 5 kll sebuah setengah lingkaran = 1/2.2.phi.r = 1/2.2.22/7.10,5cm(karena 21cm merupakan diameter) = 22/7.10,5cm = 33 cm