On a number of posts, like this, I have seen people state that a triangle is "in AP". Can someone explain what that abbreviation stands for in this context?
2026-04-07 19:31:20.1775590280
What does AP mean in the context of triangle proofs?
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Here it means arithmetic progression, so if the sides are $a,b,c$ we have $a+d=b, b+d=c$ for some $d$. You also see GP for geometric progrssion.