Q. 27 A4.0( 9 Votes )

# If the length of radius of a circular field was increased by 10%, let us write by calculating what per cent it increase the area of circular field.

Let the radius of the circular field be r units.

The area of a circle = πr2

Now, increasing the radius to 10%

Area of new circle = π(1.1r)2

Area of new circle = 1.21πr2

Increase in area =1.21πr2 - πr2 =0.21πr2

Per centage increase in the area of circular field

Percentage increase = 21%

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