Circle

• What is a circle?

  A circle is a closed curve where all points are equally distant from the center.
• What is an arc?

  An arc is a portion of the circumference of a circle.
• What are the types of circles related to their centers?

  1. Concentric circles: Two or more circles with a common center.
  2. Eccentric circles: Circles having no common center.
• What is an ellipse?


  An ellipse is an oblique circle with two axes: the minor and major axis.
• What is the radius of a circle?

  The radius is a line segment from the center to any point on the circle.
• What is a chord?

  A chord is a line segment whose endpoints lie on the circle.
• What is a diameter?


  The diameter is a chord that passes through the center of the circle.
• What is a sector of a circle?

  A sector is a portion of a circle bounded by two radii and the intercepted arc.
• What is a segment of a circle?

  A segment is a portion of a circle bounded by an arc and a chord.
• What is the circumference of a circle?

  The circumference is the distance around the circle.
• How is the circumference of a circle calculated?

  The circumference is equal to the diameter multiplied by $3.1416$.
• What is a quadrant in relation to a circle?

  A quadrant is one-fourth of the entire area of the circle.