Question

the length, breadth and height of a rectangular hall are 30m,25m and 18 m respectively. find the cost of painting its outer surface at 12 per m×m​

Answer 1

Answer:

Lateral surface area of rectangle=2(l +b) h

2(30+25) 18

2x55x18=1980 m^2

Cost of painting=1980x12

=23, 760m^2

Answer 2

Given

l=30m                    b=25m                    h=18m

Curved surface area of rectangular hall =2(l+b)h

                                                                     =2(30+25)18

                                                                     =2×55×18  

                                                                     =1980m^2

Cost of painting=1980×12= ₨23760

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