find the area of the shaded portion. All corners are right angled
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area of big rectangle = l×b
= 12×18 = 216 cm²
length of small rectangle = 18-1.5+1.5
= 18-3 = 15 cm
breath of small rectangle = 12-4 = 8 cm
area of small rectangle = l×b
= 15×8 = 120
area of shaded region = area of big rectangle - area of small rectangle
= 216-120
=. 96cm²
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