Compute sin(pi/4) by Hand with a Special Triangle

We compute sin(pi/4) by hand with no calculator. We do this by using a special triangle. I hope this helps someone who is learning trigonometry.

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Thank you:)

[gaetanramos]

Nice, that's exactly how I teach trig basics to my 9th graders - and also 11th graders who did miss some lessons in 9th grade because of you know what. Always start with a triangle! I fancy the enquiry-based approach of maths teaching and I think you grasp it very well.

[AB-etnj]

I'm sure beginners would ask: but where did you get the triangle with angles pi/4 from? This is a basic trig question to many, but would be helpful to be complete in your explanation

[pinedelgado]

I so fricken LOVE THIS!!! Thank you lots, Prof. Dr. MS, PhD!!! No wonder you're one of my FAVORITE YouTube personalities!!!

[mr.unlucky]

Hey just want you know that your videos motivated and helped me on my math subjects <3. Can you also do a video about "Learn Physics from START to FINISH" I really want to read the books I need for my physics class. Furthermore, can also make a video about "Learn Engineering from START to FINISH" for future reference. :)

[gvi]

Wait are you using your mouse to write ?

[diov]

Sir plz review a book, named 'The Concept Of Physics' by H.C. Verma, and indian physics teacher and i bet you'll definitely like

[bradpotts]

how do you know the other side lengths in this?
edit: nevermid
brain fart on that one