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Kelas 4 MatematikaBab Bangun Datar Sederhana
a] Keliling = 22
2 x π x r = 22
2 x 22/7 x r = 22
r = 22 x 7/44
r = 3,5 cm
b] Luas = π x r x r
Luas = 22/7 x 3,5 x 3,5
Luas = 38,5 cm²