Answer
$d=\sqrt{a^2+b^2}$
Work Step by Step
The distance $d$ between the points $(x_1, y_1)$ and $(x_2, y_2)$ can be found using the distance formula:
$d=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}$
Thus, the distance from the origin, which is at $(0, 0)$, to the point $(a, b)$ is:
$d = \sqrt{(a-0)^2+(b-0)^2}
\\d=\sqrt{a^2+b^2}$
