*
clouds are not spheres,
mountains are not cones,
coastlines are not circles,
and bark is not smooth,
nor does lightning travel in a straight line ...
*

Do you agree?

What is this quotation saying?

What do clouds, mountains, coastlines, bark and lightning have in common?

**Rough, natural**

What do spheres, cones, circles, and straight lines have in common?

**Euclidean, man-made**

What are some concise ways to describe a circle?

** Center and radius, formula in x, y, and r.**

What are some concise ways to describe a mountain?

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