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Area of inner shape = l× b = 20×16=320
area of outer surface = l×b= 28×24 = 672
now according to questions
the area of shaded portion is = 672 - 320 =352cm²
area of outer surface = l×b= 28×24 = 672
now according to questions
the area of shaded portion is = 672 - 320 =352cm²
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