nomor 4
= luas lingkaran
= phi kali jari2 kali jari2
= 22/7 kali 21 kali 21
= 22 kali 3 kali 21
=1.386
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nomor 4
= luas lingkaran
= phi kali jari2 kali jari2
= 22/7 kali 21 kali 21
= 22 kali 3 kali 21
=1.386