Evaluate
20\sqrt{13}\approx 72.111025509
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\sqrt{1600+60^{2}}
Calculate 40 to the power of 2 and get 1600.
\sqrt{1600+3600}
Calculate 60 to the power of 2 and get 3600.
\sqrt{5200}
Add 1600 and 3600 to get 5200.
20\sqrt{13}
Factor 5200=20^{2}\times 13. Rewrite the square root of the product \sqrt{20^{2}\times 13} as the product of square roots \sqrt{20^{2}}\sqrt{13}. Take the square root of 20^{2}.
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