Kai Burghardt

1. Community
2. Study Group
3. Transformations

Maybe it should be highlighted that (in two‐dimensional geometry) measuring an angle CCW (counter‐clockwise) is positive is a convention. The angle ∡𝑃𝐶𝑄 can mean the angle measured CCW from 𝑃 to 𝑄...

1. Community
2. Computing Platform Community Discussions
3. Prime Numbers Fit in a Quadratic - Exciting Discovery!

Yes, exciting to a middle/high school student who just got acquainted to function graphs (I see you’re playing with Desmos). In mathematics, however, prime–generating polynomials is an observation ...

1. Community
2. Content Requests and Feedback
3. JROTC

−1 With all due respect, the United States military has plenty of resources to run its Junior Reserve Officers’ Training Corps program.

1. Community
2. Feature Requests and General Site Feedback
3. I wish there were Health and Medicine quizzes and exercises

Well, the Health and Medicine Course does have some exercises. It’s just that there is so, so much to learn, a great deal being just plain memorization. I don’t think KA’s mastery‑based learning bu...

1. Community
2. Computing Platform Community Discussions
3. Python 3.13 Expression Evaluation Clarification

The >>> indicates you are using the REPL environment. Read – Evaluate – Print – Loop. REPL environments are available for many programming languages, primarily interpreted programming languages suc...

1. Community
2. Technical Issues and Workarounds
3. Using old version of a course

Well, 67andy67, the new URL is https://www.KhanAcademy.org/science/ap-college-physics-1. Some old videos can (also) be accessed via the Physics archive course, but all old exercises are gone.