Hi Shunobi,
Your Question:
What is the sum of the measures of the interior angles of a pentagon?
Answer:
540 degrees
the sum of all interior angles of any polygon is
180(n - 2).......... n = number of sides.
now, a pentagon, has PENTA=5, sides, so then the sum of all interior angles will be 180( 5 - 2), or 540°.