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= s√2
= 7√2
L.diarsir = L.linkaran - L.persegi dalam
= 1/4 .π d² - s²
= 1/4 . 22/7 . (7√2)² - 7²
= 1/2 .11/7 . 49 .2 - 49
= 11 .7 - 49
= 77 - 49
= 28 cm²