ABC is an equilateral triangle of side 30m. A Cow is tied at vertex A bymeans of 10m long rope. What is the area the cow can graze in.

Question

( A ) \large\frac{35}{3}\pi m^2
( B ) \large\frac{50}{3} m^2
( C ) \large\frac{50}{3}\pi m^2
( D ) \large\frac{40}{3}\pi m^2