Question

Se dau A (2,3) B (1,5) . Scrie OA si OB

Answer 1

$A(2,3) \\ B(1,5) \\ O(0,0)$

$OA=\sqrt{{(x_{A}-x_{O})}^{2}+{(y_{A}-y_{O})}^{2}}$

$OA=\sqrt{{(2-0)}^{2}+{(3-0)}^{2}}$

$OA= \sqrt{ {2}^{2} + {3}^{2} }$

$OA= \sqrt{4 + 9}$

$OA= \sqrt{13}$

$OB=\sqrt{{(x_{B}-x_{O})}^{2}+{(y_{B}-y_{O})}^{2}}$

$OB=\sqrt{{(1-0)}^{2}+{(5-0)}^{2}}$

$OB= \sqrt{ {1}^{2} + {5}^{2} }$

$OB = \sqrt{1 + 25}$

$OB = \sqrt{26}$