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= 2kali akar (200.96 x 3.14)
= 2kali akar (631.0144)
= 2kali 25.12
= 50.24
b) rumus sama :)
= 2kali akar (1256 x 3.14)
= 2kali akar (3943.84)
= 2kali 62.8
= 125.6
:D