Just as Phileas Fogg made it around the world in 80 days, you can navigate around the Geometry section using just 180 degrees. Here’s how:

## Around the problem in 180 degrees

Knowing these two rules can unlock many esoteric questions.

- There are 180 degrees in a straight line.
- There are 180 degrees in a triangle.

Let’s look at these in the wild.

Here’s another hard problem where you can leverage these two rules to solve it.

### Your turn

Can you get around this problem in 180 degrees?

What is the value of *c* in terms of* a* and *b*?

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