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616 Cm² = 22/7 x r²
r = Akar Dari ( 616 / 22/7 )
= Akar Dari ( 616 x 7/22 )
= Akar Dari ( 4312 / 22 )
= Akar Dari 196
= 14 Cm
Keliling = 2 x Phi x R
= 2 x 22/7 x 14
= 2 x 22 x 2
= 44 x 2
= 88 Cm ( A )