# Thread:

1. ## Locus

What is the locus of all points from which a given segment a is seen at a given angle A? It has a name?
In spanish it is the "arco capaz" and in french "arc capable". What about english?

2. Originally Posted by mercedes
What is the locus of all points from which a given segment a is seen at a given angle A? It has a name?
In spanish it is the "arco capaz" and in french "arc capable". What about english?
Hi mercedes.

I found the article Arco capaz on the Spanish Wikipedia site, and from what I understand, an arco capaz is the locus of all points P from two distinct fixed points A and B such that the angle APB is a fixed angle.

I don’t think there is a special name for this arc in English. Clearly the locus is an arc of a circle, so we just call it that in English. If the arc is smaller than a semicircle (i.e. if $\angle\,\mbox{APB}$ is greater than 90°) it is called a minor arc; if it is larger than a semicircle (i.e. the fixed angle is acute) it is called a major arc.

Espero que esto te ayude.
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