Question

A field in the form of of an equilateral triangle of side 100m. A horse is tied to a vertex of the field ,with a 10 m long rope.Over what area can the horse graze?

Answer 1

Equilateral triangle means vertex angle is 60.(that side 100m is useless to answer this question)
Area of sector = $\frac{theta}{360} * \pi r^{2}$
                        =$\frac{60}{360} * \frac{22}{7} * 10^{2}$
                        =$\frac{1}{3} * \frac{11}{7} *100$
                         =2147.61m square