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Solution


Q.

The chain and gears of bicycles or motorcycles, as well as the belt around pulleys, are real-life examples of tangents to a circle. One such example is shown in Fig, where PI and PA represent tangents to the gears of a bicycle.

Based on the above information, answer the following questions:

 

(i) If PI = 20 cm, then find PA.
1 20 cm  
2 40 cm  
3 60 cm  
4 30 cm  

Ans.

(1)

PI and PA are tangents to the circle.
As tangents from an external point to a circle are equal,
∴ PI = PA = 20 cm