A rectangular tank is 21cm long, 13cm wide and 18cm high and contains water up to a height of 11cm then the total surface area
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length=21cm
breadth=13cm
height=18cm
TO FIND THE TOTAL SURFACE AREA:
To tal surface area =2(lb + bh + hl)
=2(21×13+13×18+18×21)
=2(273+234+387)
=2(885)
=1770 cm^2
[Therefore;required answer=1770cm^2]
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