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Jari - Jari = ( Keliling ÷ ) ÷ 2
= ( 440 ÷ ) ÷ 2
= ( 440 × ) ÷ 2
= 140 ÷ 2
= 70 Cm
Luas = × r²
= × 70²
= × 4900
= 15.400 Cm³