4
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28
sqrt(28) + sqrt(63) =sqrt(7 x 4) + sqrt(7 x 9) =[ sqrt(7) x sqrt(4) ] + [ sqrt(7) x sqrt(9) ] =2 sqrt(7) + 3 sqrt(7) =5 sqrt(7) = 13.229 (rounded)
Sqrt 28 = sqrt 4 x sqrt 7 = 2 root7 = 5.2915 in each side
1.6531
49