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Tau Day 2026: Exploring why π² is approximately 10

Mihai Maruseac

3h ago· 3 min readenOpinion

education science mathematics holiday/observance

Summary

A brief, lighthearted blog post celebrating Tau Day (June 28, where τ = 2π). The author reflects on the aesthetic advantages of using τ (tau) over π in circle formulas, noting that τr and τr²/2 parallel the physics formulas mv and mv²/2. The post then explores the mathematical curiosity that π² ≈ 10, and that π² is also approximately equal to g (gravitational acceleration at sea level in m/s²), connecting these approximations in a playful way.

Source

Hacker NewsTau Day 2026: Exploring why π² is approximately 10mihai.page

Key quotes

· 3 pulled

I still think that τr and τr²/2 are better formulas than 2πr and πr², since they match the mv and mv²/2 ones (and many other reasons).

But that ship has sailed, so τ is relegating to just being the double of π.

Did you know that π² ≈ 10 and π² ≈ g (where g is the acceleration due to gravity at sea level)?

Snippet from the RSS feed

It's tau day today, double the pi(e). So, let's see why pi square is nearly 10

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