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It is (65 + 100)/2 = 165/2 = 82.5
.65
540
65 85-45=40 40/2=20 45+20=65 85-20=65
NO!!! The square root of '65' is between 8 & 9. Remember 8^2 = 64 & 9^2 = 81 By Trial and Error 8.1^(2) = 65.61 8.05^(2) = 64.8025 8.06^(2) = 64.9636 8.065^(2) = 65.044225 8.064^(2) = 65.028096 8.063^(2) = 65.65.0119... 8.062^(2) = 64.9958... 8.0622^(2) = 64.999... 8.06225^(2) = 64.99987... 8.062255^(2) = 64.99995569 ~ 65 Hence the Square Root of '65' is 8.062255 ... To 5 d.p.