.. _right triangle:

right triangle
==============

.. index:: figures,triangles

..

  Further, of :ref:`trilateral figures`, 

  a **right-angled triangle**  is that which has a :ref:`right angle`, 
  
  an **obtuse-angled triangle**  that which has an :ref:`obtuse angle`, 
  
  and an **acute-angled triangle**  that which has its three :ref:`angles acute <acute angle>`.

  -- Euclid