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keliling : 2 × 3,14 × 20 = 125,6 cm
luas : 3,14 × 400 = 1256 cm^2
jawaban bagian d
keliling : 36 × 3,14 = 113,04
luas : 3,14 × 18 × 18 = 1017,36
K=3,14 x diameter (2xjari jari)
K=3,14 x40 cm
K=125,6 cm
D.
K=3,14 x36 cm
K=113,04 cm