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2014-07-29T22:10:00+05:30

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Use the formula
AB²  =  AC² + BC²  - 2 AC  BC  Cos C
       =  250² + 300²  -  2  250  300  1/√2           as  cos 45 = 1/√2
       = 50² (25 + 36 - 60 /√2)  = 50² (61 - 30 √2)
AB =  50 ( 61 - 30 √2 )^1/2  meters



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2014-07-29T23:25:16+05:30
Using Pythagoras  theorem 
AC²  =  AB² + BC² 
AB²  =  AC² - BC²      
        =  250² - 300²
       =62500 - 90000
       =27500
AB  =
√27500
 = 165.83
        




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