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hello dued please refer pic above
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( i )Circumference of circle = 123.2 cm
→ 2πr = 123.2 cm
→ r = 123.2/2π
→ r = 19.6 cm ________"'
( ii ) Area of circle = πr²
= π(19.6)²
= 1206.3 cm² __________"'
( iii ) If radius is doubled
New radius = 2r = 2 x 19.6 = 39.2 cm
New area of circle = π(2r)²
= π(39.2)²
= 4825.05 cm² ________"'
Now,
new area/ old area = 4825.05/1206.3
= 4 times (approx.) ___________"'
Hope it helps....
^___°
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