Triangle xyz is isosceles. Angle y measures $a$ degrees. What expression represents the measure of angle x?

Which of the following statements is true about the tangent function $\tan$ in a right triangle?

In a right triangle, if angle 1 is a right angle so $m\angle 1=90°$, what is the measure of angle 2 if the third angle is $45°$?

In a right triangle, which of the following ratios represents the cosine of angle $\theta$?

Triangle $ABC$ is a right triangle with angles $A$, $B$, and $C$. If angle $C$ is the right angle, which statement is true about the measures of angles $A$ and $B$?

$\text{If two parallel lines are cut by a transversal, then the pairs of alternate interior angles are:}$

In the context of right triangles, how do rays $ab$ and $ac$ relate to the formation of an angle at vertex $a$?

If triangle $RST$ is an acute triangle, then the measure of angle $S$ must be

Which of the following statements best describes the relationship between the acute angles in a right triangle according to the linear pair perpendicular theorem?