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Luas 1/2 lingkaran = 1/2 x 22/7 x 21 cm x 21 cm = 693 cm
Luas total = Luas persegi - Luas 1/2 Lingkaran = 1764 cm - 693 cm = 1071 cm
lingkaran = diameter 42 jadi jari-jarinya 21
persegi p = sisinya 42
jadi
- × = 1764 - 693 = 1071