I have three sides yet cannot be seen, my angles are sharp but I am never keen. What am I?

Category: Brain · Difficulty: hard

Hint: Consider geometric concepts rather than physical shapes.

Answer

A triangle's properties

Explanation

The riddle refers to the concept of a triangle, focusing on its mathematical properties rather than a physical form.

This is a hard brain riddle — a tricky one that takes a little thought. The answer is A triangle's properties.

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