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L persegi = s × s = 40 × 40 = 1600
Luas 1/4 ling = 1/4 × phi × r^2
= 1/4 × 3,14 × 40^2
= 1256
Jadi luas daerah arsir = 2 × (1600 - 1256) = 688
Semoga membantu dan mudah dipahami
#FunWithMath