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Summary
There can never be just one angle.
- Explore how a lone angle creates a second angle. And the two angles always add up to 360º.
- Explore how 2, 4, 6, or even 8 intersecting angles *still* add up to 360º.
- Browse online city maps ([Google Maps](https://maps.google.com), [Open Street Maps](https://www.openstreetmap.org), etc) to find an interesting intersection of streets. Measure these angles and check that they also add up to 360º.
- Create their own intersection of streets. They'll label the street names, mark interesting sights, and measure each angle, ensuring that they add up to 360º.
