Theory:

Tangent:
If a line touches the given circle at only one point, then it is called a tangent to the circle.
Real-life examples of circles and tangents:
  • When a bullock cart moves along a road, then the road becomes the tangent at each point when the wheels roll on it.
 
bullock-cart-3619974__340.jpg
 
  • When the wheels of a cycle rotate, the chain becomes the tangent at each point of the gear of a bicycle.
 
bicycle-557046_960_720.jpg
 
  • When a coin is placed over a ruler, the ruler acts as a tangent to the coin at each point when it is rolled over it.
 
shutterstock_53316460.jpg
Reference:
https://pixabay.com/photos/bullock-cart-cart-transport-3619974/
https://pixabay.com/photos/bicycle-gear-golden-hipster-chain-557046/