[kmath-radian-to-degree] Add a convertRadiansToDegrees function to kmath

[nishasy]

Summary:

Currently kmath has a convertDegreesToRadians function, but not the other way around.

• Add convertRadiansToDegrees function to kmath
• Replace all the identical function in other repos with this new one

Issue: none

Test plan:

yarn jest packages/kmath/src/angles.test.ts
yarn jest

[SonicScrewdriver]

LOVE IT. Thank you for cleaning up our duplicated math functions!

[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (8651673) and published it to npm. You
can install it using the tag PR2190.

Example:

yarn add @khanacademy/perseus@PR2190

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR2190

[github-actions]

Size Change: +77 B (+0.01%)

Total Size: 1.48 MB

Filename	Size	Change
packages/kmath/dist/es/index.js	86.9 kB	+70 B (+0.08%)
packages/perseus-editor/dist/es/index.js	688 kB	+7 B (0%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	39 kB
packages/keypad-context/dist/es/index.js	760 B
packages/math-input/dist/es/index.js	77.6 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-core/dist/es/index.js	46.2 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus-score/dist/es/index.js	115 kB
packages/perseus/dist/es/index.js	376 kB
packages/perseus/dist/es/strings.js	5.82 kB
packages/pure-markdown/dist/es/index.js	3.66 kB
packages/simple-markdown/dist/es/index.js	12.5 kB

_{compressed-size-action}

[jeremywiebe]

No action needed, but I was musing on naming in this file. We have calculate, convert, get, and bare action naming.

I think I'd be inclined to remove the prefixes as they don't really add much value (is there a difference between "calculating" or "converting" or "getting" a value given another value? It's all a transformation/calculation.

That would leave us with an angles API like this:

• degreesToRadians(degrees: number): number
• radiansToDegrees(radians: number): number
• angleToDegrees([x, y]: Coord): number
• angleFromVertex...
• clockwiseAngle...

Not asking you to change anything, but I feel having a consistent naming convention for these types of things is useful. :) Dig in if you feel motivated and agree though!