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L persegi pjg = 48 x 42 cm = 2016 cm²
L linkrn = 2.pi.r² = 2 x 22 per 7 x (21.21)
=44 per 7 x 441 = 19.404 per 7 = 2772
Luas yg di arsir = 2772 - 2016 = 756