Circumference of a Circle

Circle Properties

• A circle is a 2D shape with a single point in the center, surrounded by a continuous round line.
• The radius of a circle is the length of a straight line segment connecting the center to any point on the edge.
• The diameter is the length of a straight line segment connecting two points on the opposite side of the circle, passing through the center.
• The diameter is twice as long as the radius.
• A line connecting two points on the edge of a circle without passing through the center is called a chord.
• The circumference is the length of the round edge of the circle.
• The area of the circle is the space enclosed within the edge, including the center.

Circumference Equation

• The ratio of the circumference to the diameter of a circle is a constant number called pi (π), approximately equal to 3.14.
• The circumference equation is C = πd or C = 2πr, where C is the circumference, d is the diameter, and r is the radius.
• The units of circumference are always units of length (e.g., centimeters, inches, meters).

Circumference Meaning

• The word "circumference" comes from the Latin prefix "circum-", meaning "around or round about".
• In math, the circumference refers to the length of the literal line that surrounds and forms a circle.

Real-World Applications

• The circumference equation can be used to solve problems involving circles in real-life situations, such as:
  • Calculating the length of railing needed for a circular patch of grass.
  • Determining the diameter of a planet based on the distance traveled by a satellite in its circular orbit.
• Professionals who use circumference in their work include:
  • Artists
  • Fashion designers
  • Engineers
  • Homeowners
  • Scientists
  • Architects
  • Cake decorators
  • Physicists

Learn about the properties of a circle and understand what circumference is. A circle is a 2-D shape with a single point in the center and a continuous line around it.