ICSE Class 9 Answered

L=45, B=30

According to the question a boundary wall is made all around the plot with a distance of 1m from the plot.                          Thus,                                 
Length of the inner boundary = 45+1+1 = 47 m                      
Breadth of the inner boundary = 30+1+1 = 32 m                                   
Height of the wall = 2.4 m (given)

Area of curved surface=2(l+b)h     
=2×(47+32)2.4                                   
=4.8×79                                               
=379.2 sq.m