**How can we calculate the area shaded in pink?**
>![](web+graphie://ka-perseus-graphie.s3.amazonaws.com/1d59aa3b316ff617dfd5170e67f06b5b2a797ead) ![](web+graphie://ka-perseus-graphie.s3.amazonaws.com/1d59aa3b316ff617dfd5170e67f06b5b2a797ead)
[[☃ radio 1]]