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Kelas 4 MatematikaBab Bangun Datar Sederhana
1] Keliling = 94,2 m
2 x π x r = 94,2 x 100 cm
2 x 3,14 x r = 9420
r = 9.420/6,28
r = 1.500 cm
r = 15 m
2] Keliling = 314 m
2 x π x r = 314
2 x 3,14 x r = 314
r = 314 / 6,28
r = 50 m
r = 5.000 cm