Shaika tied her pet dog with a 10m long rope to a pole in the garden. The dog started to take circular rounds around the pole with straight rope. Find the distance covered by the dog in 50 rounds.

Let the pole be the centre of circle and hence we get the straight rope's length as it's radius.
Hence, the radius of circle = 10m
The dog takes circular rounds around the pole which means that it move along the circumference of the circle.
Circumference of circle = pi*r²
                                       = 3.14*10²
                                      = 3.14*100
                                        = 314m
Now, the dog takes 50 rounds and that equals- Circumference of circle*50 = 314*50
                                                                                                                        = 15700m
Hence, the dog covers the distance of about 15700 m in 50 rounds.
Hope this helps you.