Question

AB←→ is perpendicular to CD←→. How many 90° angles are formed by the intersection?

Answer 1

4. Think of a lower t, there are 4 equal angles

Answer 2

4

Explanation:

If two lines are perpendicular to each other, they are said to create a 90° angle at the point of intersection.

There are clearly four 90° angles when lines AB and CD meet at 90°. It is shown in the picture attached. [Note: even if you translate the intersection point up or down, still there are four 90° angles.]