I am fundamental to geometry, essential for navigation, yet I can’t be touched. What am I?
Category: Knowledge · Difficulty: hard
Hint: Consider the ratio of a circle's circumference to its diameter.
Answer
Pi
Explanation
Pi (π) is a mathematical constant representing the ratio of a circle's circumference to its diameter, crucial in geometry.
This is a hard knowledge riddle — a tricky one that takes a little thought. The answer is Pi.
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