Conversion of radians and angles in JS

Read a lot of tutorials online, are written too complex, in fact, arc and angle conversion is very easy

Radian = angle * MATH.PI/180;

Angle = Radian * 180/MATH.PI;

It's so simple, just look at the calculator,

Sin30 is 0.5, what is the value in the program? Console.log (Math.sin (30*math.pi/180));

The value is slightly biased, but it doesn't matter, JS itself is not good at arithmetic.

Finally, review the sine, cosine, tangent, cotangent.

Sine: Opposite than hypotenuse

Cosine: Edge ratio hypotenuse

Tangent: to Bembirin Edge

Cotangent: Edge-to-side ratio

There's also a secant and a cut,

Secant: hypotenuse ratio to edge

Residual cut: hypotenuse than the Edge

Finally, I hate the tutorials that complicate simple questions online.

Conversion of radians and angles in JS