Today, we write down Gauss' magical trigonometric identities for regular heptadecagon.

### Gauss' trigonometric identities for heptadecagon

Today, we write down Gauss' magical trigonometric identities for regular heptadecagon.

### Construction algorithm

In our previous post, we have learnt about

*Similar Triangles*and the

*Right Triangle Altitude Theorem*. Today, continuing our journey in the garden of geometry, we want to find answer to the following question

Given a line segment of length $r$, by compass and straightedge, what kind of shapes can we construct?

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