Who was the first Qin emperor?

Equilateral triangle pbj is inscribed in a circle as shown. determine the measure of arc pjb.

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted

Identify the youngest layer in the figure ( have to click one letter)