An issue with these two curved beam homework problems

[Noob of the Maths]

Homework Statement

Curved beams

Relevant Equations

P/A-M(R-rA)/ArAe

Hi, good evening/morning/night!

I have a problem with this 2 homework problems about curved beams.

In both I must calculate the stress at points A and B.

My procedure is correct, but for some reason in:

First problem - the effort in A is very close to that of the teacher, but the effort in B is very different.

Second problem - In both efforts I am close to the teacher's results, but they are quite different.

I don't think I'm too far away, but I must be doing something wrong somewhere and I can't figure out where.

I would greatly appreciate your help.

 

[Lnewqban]

The pictures of your calculations are barely visible.
Could you please recreate the text of both problems?
I can’t see any load on the second one.
Sorry

 

[Noob of the Maths]

The pictures of your calculations are barely visible.
Could you please recreate the text of both problems?
I can’t see any load on the second one.
Sorry

I am very sorry, they have already been corrected in the main text.

In the first problem it does not have a load, so the "P/A" is omitted from the formula.
In the second it is 5KN the load