In Three.js the axes in their 3D environment to rotate 360 degrees, we have to use radians and with this we have to use PI; where a full PI equals 360 degrees; in this case, we want 180 degrees, that is, half PI:
cube.rotation.x = Math.PI * .5
In the example above, we are applying it to a cube, which was the first geometric figure in Three.js that we created earlier.
