Why did the obtuse angle go to the beach?

This clever math joke uses a classic pun, playing on the dual meaning of the word "degrees." In geometry, an obtuse angle is precisely defined as an angle that measures more than 90 degrees. So, when the setup asks why our angular friend is heading to the shore, the first part of the punchline is simply stating its fundamental mathematical characteristic.

But the real chuckle comes from the second interpretation: "over 90 degrees" as a temperature. Suddenly, this abstract geometric shape is personified, feeling the heat and seeking relief just like any of us would on a scorching day. It's the unexpected twist from a mathematical fact to a relatable, hot weather scenario that makes this pun-tastic brain tickler so delightfully warm, even if you prefer your angles a little sharper.