Myles, a freshman, was 4 of 6 from 3-point range and Robinson was 5 of 7. Rider (7-5) shot 12 of 25 from behind the arc in the game (48 percent).
Leading 56-48 the Broncs outscored Monmouth 10-3, sparked by three points each from Robinson and Danny Stewart, to take a 66-51 advantage with 3:50 remaining. Stewart finished with a career-high 12 rebounds.
Rider shot 42.6 percent from the field (23 of 54) and outrebounded the Hawks 42-31.
Monmouth used a 14-5 run to cut it to 31-26 with 2:33 left in the first half. The Broncs answered with eight straight points, including six on a pair of 3s by Tommy Pereira to lead 39-26 at the half.