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jawabannya yang a 125,6
jawabannya yang b 26,376
diameter (d) = jari jari × 2
a) 20 cm
diameter = 20 cm × 2
diameter = 40 cm
keliling = 3,14 × d
keliling = 3,14 × 40 cm
keliling = 125,6 cm
b) 4,2 cm
diameter = 4,2 cm × 2
diameter = 8,4 cm
keliling = 3,14 × 8,4 cm
keliling = 26,376 cm