The shape below is constructed using four semi-circles. It is called a Salinon.

What is the relationship between the area of the shaded region and the area of the circle whose diameter is $AB$?

Inequality/inequalities. 2D shapes and their properties. Circle properties and circle theorems. Patterned numbers. Number theory. Making and proving conjectures. Creating and manipulating expressions. Regular polygons and circles. Area - circles, sectors and segments. Mathematical reasoning & proof.