text: /**
   * 009 �������� �ﰢ���� ���� ����
   * 
   * @author: Choi Minseo
   * @param {number} a
   * @param {number} b
   * @param {number} c
   * @param {number} r
   * @return {number} Inscribed circle and triangle area formula
   * 
   */
  export function inscribedCircleTriangleArea(a, b, c, r) {
      return (((a + b + c) / 2) * r)
  }
  
  /**
   * 010.1 �������� �ﰢ���� ���� ����
   * 
   * @author: Choi Minseo
   * @param {number} a
   * @param {number} b
   * @param {number} c
   * @param {number} r
   * @return {number} Inscribed circle and triangle area formula
   * 
   */
  export function circumscribedCircleTriangleArea_Side(a, b, c, r) {
      return (a * b * c / 4 / r)
  }
  
  /**
   * 010.2 �������� �ﰢ���� ���� ����
   * 
   * @author: Choi Minseo
   * @param {number} a
   * @param {number} b
   * @param {number} c
   * @param {number} r
   * @return {number} Inscribed circle and triangle area formula 
   * 
   */
  export function circumscribedCircleTriangleArea_Angle(a, b, c, r) {
      return (2 * r * r * (Math.sin(a)) * (Math.sin(b)) * (Math.sin(c)))
  }
  
  /**
   * 031 ���� ����
   * 
   * @author: Naesung
   * @param {number} r
   * @return {number} The area of circle
   * 
   */
  export function circleArea(r) {
      return ((Math.PI) * (r ** 2))
  }
  
  /**
   * 032 ���� �ѷ�
   * 
   * @author: Choi Minseo
   * @param {number} r
   * @return {number} The circumstance of circle
   * 
   */
  export function circlePerimeter(r) {
      return (2 * (Math.PI) * r)
  }
  
  /**
   * 034 ���ְ��� �߽ɰ�
   * 
   * @author: Choi Minseo
   * @param {number} a
   * @return {number} The center angle of circumferential angle
   * 
   */
  export function circumference(a) {
      return (2 * a)
  }
  
  /**
   * 039 ��ä���� �߽ɰ� ǥ��_rad
   * 
   * @author: Choi Minseo
   * @param {number} r
   * @param {number} l
   * @return {number} The center angle of sector form (radian)
   * 
   */
  export function circularSectorAngle(r, l) {
      return (l / r)
  }
  
  /**
   * 040.2 ��ä���� ����_rt_no
   * 
   * @author: Choi Minseo
   * @param {number} r
   * @param {number} t
   * @return {number} THe area of sector form
   * 
   */
  export function circularSectorArea_rt(r, t) {
      return (0.5 * r * (t ** 2))
  }
  
  /**
   * 040 ��ä���� ����_rl
   * 
   * @author: Choi Minseo
   * @param {number} r
   * @param {number} l
   * @return {number} The area of sector form
   * 
   */
  export function circularSectorArea_rl(r, l) {
      return (0.5 * r * l)
  }
  
  /**
   * 041 ȣ�� ���� ����
   * 
   * @author: Naesung
   * @param {number} r
   * @param {number} l
   * @return {number} The length of arc
   * 
   */
  export function arcLength(r, l) {
      return (r * l)
  }
  
  /**
   * 210 60����-���� ��ȯ
   * 
   * @author: Choi Minseo
   * @param {number} deg
   * @return {number} Convert degree to radian
   * 
   */
  export function degreeToRad(deg) {
      return deg * Math.PI / 180
  }
  