Tie for Two:
B and C are triangles
A and C have right angles
B and D have obtuse angles
A and C show angles with a sum of 90 degrees
A and C have perpendicular lines

Thread for Three:
A, B, and C show angles adding to 180 degrees
A, B, and C have one known angle

Fit for Four:
Four have missing angles
Four have an x term
Four have acute angles
Four have a 40 degree angle