Evaluate
3\sqrt{170}\approx 39.115214431
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\sqrt{21^{2}+\left(\frac{66}{2}\right)^{2}}
Divide 42 by 2 to get 21.
\sqrt{441+\left(\frac{66}{2}\right)^{2}}
Calculate 21 to the power of 2 and get 441.
\sqrt{441+33^{2}}
Divide 66 by 2 to get 33.
\sqrt{441+1089}
Calculate 33 to the power of 2 and get 1089.
\sqrt{1530}
Add 441 and 1089 to get 1530.
3\sqrt{170}
Factor 1530=3^{2}\times 170. Rewrite the square root of the product \sqrt{3^{2}\times 170} as the product of square roots \sqrt{3^{2}}\sqrt{170}. Take the square root of 3^{2}.
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