perplexus.info :: Just Math : Sine gives pi?

Sine gives pi? (Posted on 2013-04-02)

Why does sin(1/5555555°) have a decimal that so closely resembles pi?

Submitted by Jer

Rating: 2.0000 (1 votes)

Solution: (Hide)

1/5555555° ≈ 1.8*10^-6° = πx10^-8 radian.
For very small angles sin(θ)≈θ
So sin(πx10^-8 radian)≈πx10^-8

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Solution	Charlie	2013-04-02 11:08:08
Solution	Kenny M	2013-04-02 08:59:29

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