Question

What is the measure of ZRST?

Answer 1

`\huge\textsf{D.}\ \boxed{79^\circ}`

`\angle RST` is an inscribed angle. This means that the measure of the angle is equal to half the measure of the intercepted arc.

`\begin{aligned}m\angle RST&=(1)/(2)m\widehat{RT}\\&=(1)/(2)(158^\circ)\\&=\boxed{79^\circ}\end{aligned}`