Question

what is the distance of (2,1) from origin ​

Answer 1

Distance formula from origin

$\sqrt{ {x}^{2} + {y}^{2} } \\ = \sqrt{ {2}^{2} + {1}^{2} } \\ = \sqrt{4 + 1} \\ distance \: \: of \: \: (2 \: \: 1) = \sqrt{5}$

Answer 2

Answer:

Let us consider origin O(0,0) and A(2,1)

=> OA = $\sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2 }$

=>OA=$\sqrt{(2-0)^2+(1-0)^2}$

=>OA=$\sqrt{2^2+1^2}$=$\sqrt{4+1}$

Therefore OA = $\sqrt{5\\}$

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