If a line has a slope of $3$, which of the following lines is perpendicular to it?

Given a right triangle where side $LK$ is $7$ units, side $KJ$ is $24$ units, and $LJ$ is the hypotenuse, what is the measure of angle $LKJ$? Round to the nearest whole degree.

If you are given two $\mathrm{angles}$ in a $\mathrm{right}\mathrm{triangle}$, what additional information do you need to determine all the $\mathrm{side}\mathrm{lengths}$ of the $\mathrm{triangle}$?

A regular polygon has $8$ sides. What is the measure of each interior angle?

Given a right triangle where one of the acute angles is $30°$ and the hypotenuse is $10$, what is the length of the side opposite the $30°$ angle (let this length be $x$)?

Given a right triangle DEF with right angle at $E$, which of the following trigonometric ratios are correct for angle $D$? Select the correct option.

Given a right triangle with angles $A$, $B$, and $C$, where $C$ is the right angle, if $m\angle A=m\angle B$ and $m\angle A+m\angle C=m\angle D$, what is the measure of angle $D$?

Given a right triangle with an angle $x$, in which triangle is the value of $x$ equal to ${\tan }^{-1}\left(\frac{3.1}{5.2}\right)$?