When the circumference of a toy ballon is increased from 20 cm to 25 cm, its radius ( in cm) is increased by :

When the circumference of a toy ballon is increased from 20 cm to 25 cm, its radius ( in cm) is increased by :
1). 5
2). $\frac{5}{\pi}$
3). $\frac{5}{2\pi}$
4). $\frac{\pi}{5}$

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