area wanted, 4 equal circles inside a square (2008 VWO Flanders MO p4)
Source:
August 7, 2020
geometrycirclesSqaurearea
Problem Statement
A square with sides and four circles of radius considered each having a vertex of have the square as the center. Find area of the shaded part (see figure).
https://cdn.artofproblemsolving.com/attachments/b/6/6e28d94094d69bac13c2702853ac2c906a80a1.png