Question

Consider the words typically associated with geometry. Are there any words that would be hard to precisely define? What words can you think of?

Answer 1

Cross Sections
Im not a very smart junior.

Answer 2

Yes. Arbelos, Congruent and Locus

Step-by-step explanation:

Many words require some History of Geometry background or a 3D/2D capability to visualize to figure it out.

Arbelos, for instance, means "shoemaker's knife". It's used to describe a figure that results from a projection of two minor circles, over a bigger semicircle.

The other case, congruent. This word is also used in other fields of Mathematics like Number Theory what could make some confusion. The meaning of Congruent in Geometry is the ability to transform one figure into another by isometry.

And finally, Locus. Reading the word locus may misguide us to think of local but Locus is a set of all points satisfying some condition, generally in a curve.