[tex]keliling \: \frac{3}{4} \: lingkaran \\ \\ \frac{47}{7} \times \frac{d}{2} \\ \\ \frac{47}{7} \times \frac{21}{2} \: cm \\ \\ 70,5\: cm \: (c)[/tex]
Penjelasan dengan langkah-langkah:
K = (3/4 × π × d) + r + r
K = (3/4×22/7×21) + 21
K = (3/4×22×3) + 21
K = 49,5 + 21
K = 70,5 cm
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[tex]keliling \: \frac{3}{4} \: lingkaran \\ \\ \frac{47}{7} \times \frac{d}{2} \\ \\ \frac{47}{7} \times \frac{21}{2} \: cm \\ \\ 70,5\: cm \: (c)[/tex]
Penjelasan dengan langkah-langkah:
K = (3/4 × π × d) + r + r
K = (3/4×22/7×21) + 21
K = (3/4×22×3) + 21
K = 49,5 + 21
K = 70,5 cm