What angle is not correctly paired with its corresponding set square type?

The correct pairings of angles with their corresponding set squares are important for various applications in plumbing, drafting, and construction.

In the context of set squares, the 30°-60°-90° triangle represents a right triangle where the angles measure 30°, 60°, and 90° respectively, making it suitable for creating and measuring right angles and other angles in plans and layouts.

The 45°-45°-90° triangle is another common set square type, characterized by two angles of 45° and one right angle of 90°. This type is ideal for tasks involving diagonal cuts or layout work where equal angles are needed, such as in leveling and aligning materials.

The error occurs with the pairing of the 90° angle in option D. There is no common set square identified merely by a 90° angle coupled with another angle of 45°. Instead, a true set square for a 90° angle would need to be paired specifically with either 45° or continue as a right triangle without a third angle assignment.

Therefore, the pairing in D does not align with established classifications of set square types in geometry. Recognizing how angles form specific geometric shapes helps to understand why certain combinations are valid