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L.Δ =
=
=
= √582200
= 763
r =
=
=
= 30,56 cm
L.diarsir = L.lingkaran - L.Δ
= 3,14 x r² - 763
= 3,14 x 30,56² - 763
= 2932,49 - 763
= 2169,49 cm²