In which right triangle is the value of $x$ equal to ${\cos }^{-1}\left(\frac{4.3}{6.7}\right)$?

In a right triangle, if angle $cbe$ is one of the non-right angles and the other non-right angle measures $72°$, what is the measure of angle $cbe$?

Given that lines a and b are parallel, and lines e and f are also parallel, if angle $m1$ is $89°$, what is the measure of the corresponding angle formed by the intersection of lines e and f with a transversal?

Given a right triangle with points $E$, $F$, $D$, $B$, $C$, and $A$, which angle is a vertical angle with $\angle EFD$?

Mary thinks the triangle is equilateral. How would you support or dispute her conjecture using trigonometric functions on right triangles?

In a right triangle, if angle $ONP$ is one of the non-right angles and the other non-right angle measures $50°$, what is the measure of angle $ONP$?

In a right triangle, if angle $A$ measures $37°$, what is the measure of the other non-right angle $B$?

Given a right triangle with angle $A$, opposite side $a$, adjacent side $b$, and hypotenuse $c$, which expression can be used to find $\angle A$?

In a right triangle, if one of the acute angles is $a$, what expression represents the measure of the other acute angle $x$?