For an angle to be in standard position, its vertex is at the origin and the initial side lies on the A) positive y-axis. B) positive x-axis. C) negative x-axis. D) negative x-axis.

Shape a is congruent to shape , as shown by a reflection across the y-axis and then a translation down units. shape b is congruent to shape , as shown by a reflection across the y-axis and then a translation down units.