area of the triangle.
</p>
<p>Once a function like the above one is defined, the programmer can use the
<code class="mendoza-code">triangle-area</code> function just like any other, say <code class="mendoza-code">print</code> or <code class="mendoza-code">+</code>.
</p>
<pre class="mendoza-codeblock"><code data-language="janet"><span class="mdzsyn-comment"># Prints "calculating area of a triangle..." and then "25"</span>
(<span class="mdzsyn-coresym">print</span> (<span class="mdzsyn-symbol">triangle-area</