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440 = 2 × 22/7 × r
r = (440 × 7) ÷ (2 × 22)
r = 3080 ÷ 44
r = 70
Luas = phi × r²
= 22/7 × 70²
= 15400 cm²
440 = 2 x 22/7 x r
440:44/7=r
440 x 7/44 =r
70 = r
L.O =phi x r x r
=22/7 x 70 x 70
= 22/7 x 4900
=15400
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