3 x d = 42 cm
[tex]keliling \: \frac{3}{2} \: lingkaran \\ 3 \times d \times ( \frac{1}{2} \pi + 1) \\ 3 \times d \times \frac{18}{7} \\ 42 \: cm \times \frac{18}{7} \\ 108 \: cm \: (a)[/tex]
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3 x d = 42 cm
[tex]keliling \: \frac{3}{2} \: lingkaran \\ 3 \times d \times ( \frac{1}{2} \pi + 1) \\ 3 \times d \times \frac{18}{7} \\ 42 \: cm \times \frac{18}{7} \\ 108 \: cm \: (a)[/tex]