What is the difference between circle and sphere?

Both a circle and sphere are circular objects. These two objects tend to cause a lot of confusion among pupils in kindergarten.

The lesson provides the core difference between circle and sphere in tabular and point form for easier understanding.

**What Is A Circle?**

A circle is a plane and a round figure whose limit consists of equidistant points from a center. It is therefore said to be a two-dimensional figure and a plane.

**Main Properties of A Circle**

**T****he center**is the point equidistant from the points on the circle**Radius**is the line from the center joining any point on the circle**Diameter**is a line that passes through the center and the endpoints lie on the circle.- The circumference is the length of one circuit along the circle
**A chord**is a line segment whose endpoints lie on the circle**Tangent**is a coplanar straight line that touches the circle at a single point**Arc**is any connected part of a circle

**What Is A Sphere?**

A sphere is a solid and round figure whose points on the surface is equidistant from the center. It is a three-dimension figure and it has a volume.

**Main Properties of a Sphere**

- The ratio of the distance of its points from two fixed points is constant.
- The contours and plane sections are circular
- It has constant width and girth
- Does not have a surface center
- The curvature is constant
- Has the greatest volume and smallest surface area

**Comparison Chart: Circle Vs Sphere**

Basic Terms |
Circle |
Sphere |

Meaning | It is a plane and a round figure whose limit consists of equidistant points from a center. | It is a solid and round figure whose points on the surface is equidistant from the center. |

Dimensions | 2D | 3D |

Formulas | πr^{2} for Area |
The area is 4πr^{2} and Volume is 4/3πr^{3} |

What is it? | A figure | An object |

Core Difference | Has a surface area only | Has both surface area and volume |

Equation | Equation of a Circle = (x−a)^{2}+(y−b)^{2}= r^{2} |
Equation of a Sphere = (x−h)^{2}+(y−k)^{2}+(z−l)2=r^{2} |

Circumference Formula | 2 π r | 2 π r |

Common Examples | Bangles and tires | Tennis balls and planets |

**Core Difference between Circle and Sphere**

- A circle is a round figure in a plane while the sphere is a round object in space.
- A circle is a 2D figure while a sphere is a 3D figure
- The area only is calculated from a circle while both area and volume on a sphere
- Examples of circles are bracelets and tires while for spheres are tennis balls and planets.

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**Comparison Video**

**Summary**

Both a circle and sphere are perfect symmetry around their centers. the core difference between circle and sphere is the dimension where a circle is a two-dimension figure while a sphere is a three-dimensional object.

**More Sources and References**

- Sphere. Wikipedia
- Sphere and Circle. Slide Share