I need a little bit of help answering this.

A) 37

Step-by-step explanation:

The Vertical Angles Theorem is used for this problem

Since it states that vertical angles are congruent just set up this equation:

74 = 2x

Division Property of Equality

34 = x

2x=74°(being vertically opposite angle)

or, x=74/2

or, x=37°

:. x=37°

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).