Problem

Is this diagram evidence enough to justify that the lines are perpendicular: the lines look square, but no right angle is marked or measured?

Clean labeled source geometry diagram without the requested classification or definition.

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What this problem is really about

A diagram can suggest a conjecture, but definitions decide whether that conjecture is proved. We’ll separate visual appearance from certified evidence and look for a right-angle mark, an angle measure, or a deduction that forces the required condition before drawing a conclusion.

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Yes, this is enough information because any two lines that cross in a diagram are perpendicular unless marked otherwise.

Yes, this is enough information because perpendicular lines do not need a marked right angle if the angle seems close to 90 degrees.

Yes, this is enough information because if the lines look square in the diagram, that shows they are perpendicular.

No, this is not enough information because the lines only look like they make a right angle, and no right angle is marked or measured.

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Is this diagram evidence enough to justify that the lines are perpendicular: the lines look square, but no right angle is marked or measured?

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