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I agree

I don't see Friday's Notebook in the downloads.

Where can problems in geometry be found?

Is the following place a good choice or one can easily find a better one?

https://artofproblemsolving.com/online

Geometry probably there:

artofproblemsolving.com/community/c4t48f4_geometry

I looked ahead a little at today's Algebra Notebook. I believe that there is an error in the code for Selected Problems 1.1.

I believe that eq1=Sum[a+k*d,{k,1,50}]==200 should be eq1=Sum[a+k*d,{k,0,49}]==200

and eq2 = Sum[a + k*d, {k, 51, 100}] == 2700 should be eq2 = Sum[a + k*d, {k, 50, 99}] == 2700