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Actually Welcome to the Concept of the Surface areas and Volumes.
Now basically here we can see that, a Square has a circle inside it.
so the shaded region will be given as,
Shaded Area = Area of Circle.
thus, we get as
Area of circle = πr^2
so here, r = d/2 = 14/2 = 7 cm
so we get as,
Area = 22/7 * 7 *7
Area = 154 cm^2.
