an open ractangular cistern is made or iron 2.5 cm thick. Its external dimensions are - 1m25cm×1m5cm×90cm. Find the TSA of the cistern
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You have to multiply than you can got your answer
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1m 25 cm = 125 cm
1m 5cm = 105 cm
90 cm
TSA = 2(LB + BH + HL)
2(125× 105 + 105 ×90 + 90× 125)
2( 13,125 + 9450 + 11,250)
2( 33,825 )
67,650 cm
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