tolong dijawab secepatnya
29. B. 132
30. A. 1.386
Penjelasan
Diameter = 42 cm
Jari-jari = 42 ÷ 2 = 21 cm
[tex]29. \: keliling = 2\pi r \\ = 2 \times \frac{22}{7} \times 21 \\ = 132[/tex]
[tex]30. \: luas = \pi \: {r}^{2} \\ = \frac{22}{7} \times {21}^{2} \\ \: \: \: \: \: \: \: \\ = \frac{22}{7} \times 21 \times 21 \\ \\ = 1.386 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
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