[tex] Keliling \: \frac{1}{2} \: lingkaran \\ \\ \frac{18}{7} \times d \\ \\ \frac{18}{7} \times 35 \: cm \\ \\ 90 \: cm \: (b)[/tex]
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[tex] Keliling \: \frac{1}{2} \: lingkaran \\ \\ \frac{18}{7} \times d \\ \\ \frac{18}{7} \times 35 \: cm \\ \\ 90 \: cm \: (b)[/tex]