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## What is the difference between a vertex and an angle?

I am 64 and missed schooling because of childhood hospitalisation. I'm embarrassed about how little I know of maths and have been reading thru the about.math site. A Kindergarten! geometry question is 'I have four sides and four vertices - what am I?' I'd not known the term vertex/vertices. When I looked it up the examples referred to solids, with faces, edges and vertices. Not 'sides'. I'm assuming that a kindergarten level is probably asking for 'a square'. But, if that is so, why not use the word 'angle'?  Many thanks. Margarita.

Margarita -

An angle usually represents a measurement - such as 90 degrees or 1/2 pi radians.

A vertex generally represents the "point" of the angle (or in later cases, a parabola or an ellipse) where the direction changes.

Let's assume you were walking on the lower edge of an equilateral (all sides the same length) triangle, heading towards the left. When you have to turn and start walking up the left edge, AT THAT POINT is the vertex.

Vertices is plural for vertex, just like indices is plural for index. (Gotta love the predictability of the english language)

PS - Don't be embarrassed - I applaud you for wanting to loop back and learn this!