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= 2. 22/7. 21
= 2. 22 . 3
= 44 . 3
= 132 cm
L = πr²
= 22/7 . 21²
= 22/7 . 441
= 441 / 7 × 22
= 63 . 22
=1386 cm
maaf kalo salah :v