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= 346,5 cm²
K = 1/4.2.22/7.21
= 33 cm
maaf kalau salah
= 1/4 . 22/7 . 21 . 21
= 1/4. 22. 3 . 21
=346,5 cm²
K = 1/4 . 2 π r
= 1/4 . 2 . 22/7 . 21
= 33 + 21 + 21 = 75 cm
kelilingnya di tambah sama 2 jari2nya soalnya kan bentuknya seperempat lingkaran jadi semua sisinya ditambahkan