Question

find the area of the shaded portion

Answer 1

$(45 \times35) - (42 \times 32) = \\ \\ area \: of \: bigge \: rectangle - \: area \: of \: smaller \: retangle$

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Answer 2

The area of shaded portion = Area of whole figure - Area of inner part
= (45*35)-(45-1.5+1.5*35-1.5+1.5)
=1575-(42*32)
=1575-1344
=1231_Ans