1.

The radius of a circle is increased to 4 times, then the ratio of the square of new circumference to the new area will be1). 2π ∶ 12). π ∶ 23). 4π ∶ 14). 1 ∶ 2π

Answer»

LET the old Radius be ‘R’ then the new Radius will be ‘4r’.

New CIRCUMFERENCE = 2 × π × (4r) = 8πr

Square of the new circumference = 64π2r2

New area = π × (4r)2 = 16πr2

∴Ratio of the square of new circumference to the new area = (64π2r2)/16πr2 = 4π ? 1


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