C2 = a2 + b2

c² = a² + b² is the third stage in Summer Lesson.
==Battleground==
*Infinite Those Guys spawn, delay 10~16.67 seconds300f~500f.
*Infinite B.B.Bunnies spawn after 10 seconds300f, delay 70~73.33 seconds2,100f~2,200f.
*Infinite B.B.Bunnies spawn after 11.67 seconds350f, delay 70~73.33 seconds2,100f~2,200f.
*Infinite B.B.Bunnies spawn after 13.33 seconds400f, delay 70~73.33 seconds2,100f~2,200f.
*Infinite Sir Seals spawn after 30 seconds900f, delay 83.33~86.67 seconds2,500f~2,600f.
*Infinite Those Guys spawn after 66.67 seconds2,000f, delay 16.67~33.33 seconds500f~1,000f.
*When the base reaches 99% HP:
**1 Teacher A spawns as the boss.
**7 Gary Gories spawn, delay 13.33~15.33 seconds400f~460f.
==Strategy==
Use Titan Cats and long-ranged attackers like Dragon Cats protected by meatshields to defeat Teacher A. Alternatively, if you have Bahamut Cat, use him, as he can kill the boss in one hit. Many Uber Rares will also be effective.
==Trivia==
*This stage's name is the Pythagorean theorem. However, the stage name in the Taiwanese version is instead "1 + 1 = 2".
==Reference==
*https://battlecats-db.com/stage/s01149-03.html
Category:Summer Lesson Stages
Category:Event Stages