What are the measures of ∠1 and ∠2? A triangle is located on top of another triangle. The top triangle has an upper angle measure of 37.1 degrees. The lower right angle is labeled angle 1. The bottom of this triangle shares part of the top of the triangle below it. The upper right angle of this triangle is labeled angle 2. The left angle measures 17.3 degrees. The right angle is unlabeled, but the exterior angle supplementary to it measures 121.8 degrees.