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12 jawaban nya C
= 30√2 ⇒ sisi miring Δ sama seperti diagonal sisi = S√2
Jadi,
Lp = 30√2 x 30√2
Lp = 900 x 2
Lp = 1800 cm²
Luas lingkaran = πr² = 3,14 . 30²
= 3,14 . 900
= 2826 cm²
Luas yang diarsir = 2826 - 1800 = 1026