Question

                                                                                                                                                                                                                  A horse is tied to a peg at one corner of a square shaped grass field of side 15 m long rope
FIND;
1. The area of that part of the field in which the horse can graze.
2. The the increase in area if the rope was 10 m long instead of 5. [use pie as 3.14]

Answer 1

so the answer will be
$\pi r^{2} /4$
so
find The Area of A circle With of Radius 15m and divide it with 4
that"s it The answer given

Answer 2

horse can graze part of 39.25 if the rope is increased to 10 then it will be 628