The Spartans (7-7) were playing their second straight game against an Atlantic Coast Conference opponent. They took a 102-69 beating from top-ranked Duke last weekend and the latest loss extended their losing streak to four games after posting a four-game winning streak.
Bethel was in a 4-for-23 slide over the previous three games before finding his touch against the Spartans. He was 2-for-13 from 3-point range in that same stretch, but hit 3-of-4 Tuesday.
UNC-Greensboro tried a zone defense to offset matchup problems in the post, but N.C. State scuttled that strategy by shooting over it and hitting seven 3s in the first half. The Wolfpack finished 11-of-29 on 3-pointers.
Cedric Simmons had 18 points for N.C. State, while Engin Atsur scored 13 of his 16 in the first half. Cameron Bennerman had 14 points for the Wolfpack, who shot 61 percent from the field.
Kyle Hines led UNC-Greensboro with 18 points, and Ricky Hickman added 13.
Five straight points by Bethel gave the Wolfpack a 16-4 lead. Dwayne Johnson scored on a drive and Hickman completed a three-point play to put a speed bump in the Wolfpack's path, but Andrew Brackman's 3-pointer at 11:35 sparked a 12-2 N.C. State run that settled it. Atsur scored the last five points in that run.
Despite being outshot 55 percent to 50 percent, N.C. State led 46-27 at halftime. UNC-Greensboro got no closer than 18 points in the second half.