In rectangle ABCD
BC=14cm
Radius of each circle=14/2=7
Length of rectangle=(7+7+7)*2=42(how did 7 come here)
Now area of rectangle=l*b=42*14=588cm sq
And area of 3 circles =*πrsq
3*22/7*7=462cmsq
Area of shaded part=588-462=126cmsq
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