Not necessarily. A pentagon can have any degree of angles as long as it adds up to 540 degrees.
Here's a formula if you need to calculate the amount of degrees in a polygon:
180(n-2)
"n" being the amount of sides the polygon has.
So, 180(5-2)=540.
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A (regular) Pentagon
A pentagon
A regular 5 sided pentagon has 5 equal interior obtuse angles of 108 degrees
Pentagon
A regular pentagon has 5 equal sides and 5 equal inside angles that add up to 540 degrees