code: public void setInscribedRadius(double radius) {
  		double side = getSideLengthFromInscribedRadius(radius, n);
  		this.circumscribedRadius = getCircumscribedRadiusFromSideLength(side, n);
  	}
docs: Sets the radius of an inscribed sphere, that is tangent to each
  of the icosahedron's faces
  @param inscribedRadius the inscribedRadius to set