408 feature request add formulas 545 548 from chapter 510 from nen en 1992 1 1

[GerjanDorgelo]

Description

ads eq. 5.45-5.48. Also notices small error in 5.37. k should be capital K.

Fixes #408

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist:

• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• New and existing unit tests pass locally with my changes

[github-actions]

Thank you so much for contributing to Blueprints! This is your Pull Request # 12 to this project.
Your contributions help thousands of engineers work more efficiently and accurately.

Now that you've created your pull request, please don't go away; take a look at the bottom of this page for the automated checks that should already be running. If they pass, great! If not, please click on 'Details' and see if you can fix the problem they've identified. A maintainer should be along shortly to review your pull request and help get it added!