Using jsxgraph to create a triangle in moodle

Below is a the diagram shown in my introductory post.
It also, incidentally, proves that jsxgraph can create diagrams in blogger.
I have left the delimiters on. They are used by moodle to filter the variables through the question type and mathjax so that the display has a maths look.
 In this instance the question type is formulas but this setup will work in calculated question type which has the same ability to pass variables into question text. Again in this instance, that would be OK as a single answer is prompted for.
In a later post I propose to look at the jsxgraph functions and/or modules used in this construction.


Not to scale.

`PQR` is an isosceles triangle, `PQ=PR`.