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Sagot :
Answer:
4
Step-by-step 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.]

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