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Penjelasan dengan langkah-langkah:
1. Tembereng
2. 2
3. 16cm
4. L = π x r²
314cm² = 3,14 x r²
r² = 314:3, 14
r² = 100
r= √100 = 10cm
K= π x d
3,14 x 20 = 62,8 cm
5. 3/4 K= 3/4xπxd
3/4x22/7x 21 = 49,5 cm