Constructing Tangents to Circles Practice Test

A line $p$ is tangent to circle $\odot Q$ at point J. Segment $QJ$ is drawn, and the right angle between $QJ$ and $p$ at $J$ is marked. Which reasoning correctly uses the radius–tangent relationship?

Line $s$ is tangent to circle $\odot O$ at point U. Radius $OU$ is drawn to the point of tangency, and the right angle at $U$ is marked. Which angle relationship is guaranteed?