In circle $O$, $AB$ and $CD$ are diameters. Arc $ED$ measures $170°$. What is the measure of arc $AE$?

Omar wants to determine $cos\theta$ in a right triangle. If the length of the adjacent side to angle $\theta$ is 5 units and the hypotenuse is 13 units, what is $cos\theta$?

In right triangles, congruent angles always correspond to which of the following properties?

In a circle, the length of an arc intercepted by a central angle is $12mm$. If the radius of the circle is $8mm$, what is the measure of the central angle in radians?

In a right triangle, if one of the acute angles measures $27°$, what is the measure of the other acute angle?

In a right triangle, if one of the acute angles measures $30°$, what is the measure of the other acute angle?

In a right triangle, if one of the acute angles measures $34°$, what is the measure of the other acute angle?

Lines a and b are parallel and are cut by transversal f. If one of the alternate interior angles is $70°$, what is the measure of the corresponding alternate interior angle on the other side of the transversal?

In circle D, if $\angle EDH$ is congruent to $\angle EDG$, what is the measure of $\angle EDH$? Choose the correct answer below.