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Luas seluruhnya
= 1/2 x 22/7 x 1,4 x 1,4
= 3,08
Luas daerah yg tidak arsir
= 1/2 x 22/7 x 0,7 x 0,7
= 0,77
Luas arsir = 3,08 - 0,77 = 2,31