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Calculate cross sectional area of 10mm bar amd 8mm bar, then divide them and you will get the no. of bars.
For Eg. - Area of 10mm bar = 78.53 sq.mm
Area of 8mm bar = 50.26 sq.mm
No. of 8mm bars in replacement for 10mm bar = 1.562 bars [ theoritical]
In practical u'll provide 2-8mm bars.
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