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Jawaban:
[tex]7. \: k = \frac{3}{4} \times 2 \times \pi \times r = \frac{3}{4} \times 2 \times \frac{22}{7} \times 35 = 3 \times 2 \times 22 \times 5 = \frac{660}{4} = 165 \: cm \: [/tex]
[tex]8. \: k = \frac{1}{4} \times \pi \times d = \frac{1}{4} \times 3.14 \times 15 = \frac{47.1}{4} = 11.775 \: cm[/tex]
koreksi
Penjelasan dengan langkah-langkah:
semoga membantu yaa
7. K=2πr K3/4=3/4.219,8.35
K=2.3,14.35 K3/4=5.769,75cm
K=219,8cm
8. K=1/4πr²
K=1/4.3,14.15²
K=176,625
