## Elementary Geometry for College Students (5th Edition)

m$\angle$ RST = 42$^{\circ}$
Using the Segment Addition Postulate: m$\angle$RST + m$\angle$TSV = m$\angle$RSV Substitute in the values from the problem. m$\angle$RST + 17 = 59 Subtract 17 from both sides of the equation m$\angle$RST + 17 - 17= 59 - 17 m$\angle$RST = 42