What quadrantal angles will result in undefined trigonometric functions?

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.

Find the measure of angle y. a. 115° b. 65° c. 43° d. 22°