A right angle is one of the types of angles that we will encounter during engineering studies.

**A right angle is one that measures** **$90°$****.** We generally mark it with a small square at the area where it is formed.

Right angles can appear in triangles, squares, rectangles, and other geometric shapes with angles of **$90°$** degrees.

To which of the 4 angles shown in the figure does the description of the right angle apply?

The correct answer is A) 90°