Reference problem
=====================



Geometry
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.. image:: images/10000201000001AA000001F4D99D5F7D70592995.png
    :width: 4.2398in
    :height: 4.9756in


.. _RefImage_10000201000001AA000001F4D99D5F7D70592995.png:

**Figure** 1.1-a **:** **element orientation.**

The pipes are oriented in space as shown in the Figure:

Global coordinates of points :math:`P0`, :math:`\mathit{P1}`, and :math:`\mathit{P2}`:

:math:`P0=(0.0;0.0;0.0)`

:math:`P1=(2\sqrt{3};0.0;0.0)`

:math:`P2=(2.0;2.0;2.0)`