56. Exemplar exercise problems XXXII

In the given figure, $ABCD$ is a trapezium with $AB || DC$, $AB = 18 \  cm$, $DC = 32 \ cm$ and distance between $AB$ and $DC = 14 \ cm$. If arcs of equal radii $7 \ cm$ with centres $A, B, C$ and $D$ have been drawn, then find the area of the shaded region of the figure.

 

 

Area of the shaded region $=$ $cm^2$