A triangle has angle measures of 20 and 40. What could be two of the angle measures of a similar triangle

Similar triangles have equal angles. I mean, if two triangles

are similar, then the angles of one triangle are the same as

the angles of the other one.

The triangle in the question has angles of 20° and 40°.

The angles of every triangle add up to 180°, so we know

that the third angle has to be 120°

If another triangle is similar to this one, then the other one

also has angles of 20°, 40°, and 120°.