Ghow long rode can be inserted a room of 20 m height 30 egh 60 breath
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area of rod=2 (lb+bh+lh)
=2 (30×60+60×20+30×20)
=2 (1800+1200+600)
=2×3600
=7200
=2 (30×60+60×20+30×20)
=2 (1800+1200+600)
=2×3600
=7200
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