sebuah lingkaran diketahui jari-jari 42 cm tentukanlah keliling dan luas permukaan tersebut
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[tex]k = 2\pi \: r \\ = 2. \frac{22}{7}.42 \\ = 264cm[/tex]
[tex]l = \pi \: r {}^{2} \\ = \frac{22}{7}.42 {}^{2} \\ = 5544 \: cm {}^{2} [/tex]
semoga membantu
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