When finding unknown alternate angles, it can be useful to look for a Z-shape. Angles 𝒂 and 42° are alternate. Alternate angles are equal, so angle 𝒂 = 42°.

ANGLES Any shape that is made of straight lines has angles, so knowing how to measure angles and how to use them is a basic skill in HVAC work. An angle is the figure formed by the intersection of two ...