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Lasir = 2/7r²
= 2/7 x 21 x 21
= 126 cm²
=( x x 21 x 21) - ( x 21 x 21)
= ( x 11 x 3 x 21) - (220,5)
= 346,5 - 220,5
= 126 cm persegi
maaf kalo salah