Question 11
Ten circular cards of radius 2 cm each are arranged as shown in the diagram.
Given that the four collinear points $A$, $C$, $E$ and $G$ are the centres of the white cards, and $AHIC$, $CIJE$, $EJKG$ and $COPE$ are rectangles and $BLMD$ and $DMNF$ are squares, what is the area, in cm², of the shaded region?
Given that the four collinear points $A$, $C$, $E$ and $G$ are the centres of the white cards, and $AHIC$, $CIJE$, $EJKG$ and $COPE$ are rectangles and $BLMD$ and $DMNF$ are squares, what is the area, in cm², of the shaded region?