Sebuah lingkaran mempunyai keliling 44 cm Berapakah luasnya?

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Dikethui:

Ditanyakan:

Penyelesaian:

Pertama kita menentukan panjang jari-jari lingkaran tersebut dengan rumus keliling lingkaran, diperoleh:

Sehingga,

Jadi, jawaban yang tepat adalah B