There are a few fundamental differences between a circle and sphere which separates them in a lot of ways. Both the circle and sphere are different, even if they are circular objects. Thus, they create a lot of confusion in understanding them. Both seem to be similar, but in reality, they have a vast difference between them. Let us have a deeper understanding of both the terms.

## Definition of Circle and Sphere

- A
**Circle**is a two-dimensional figure whereas, a**Spher**e is a three-dimensional object. **Area of a Circle =**π r^{2 }and**Area of a Sphere =**4 π r^{2}- A
**circle**has no volume and**the Volume of a Sphere =**4/3π r^{3} - A
**circle**has all points at the same distance from its centre along a plane, whereas in a**sphere**all the points are equidistant from the centre at any of the axes. - We can only determine the area in case of a Circle, while in Sphere, we can calculate the surface area as well as volume.

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## What is the Difference Between Sphere and Circle?

Circle and Sphere Differences | ||
---|---|---|

Differentiating Property | Circle | Sphere |

Dimensions | Circle is a 2-dimensional figure. | Sphere is a 3-dimensional figure. |

Area Formula | Area of Circle = π r^{2} | Surface Area of a Sphere = 4 π r^{2} |

Volume Formula | Circle does not have volume. | Volume of a Sphere =4/3π r^{3} |

Diameter Formula | Diameter of a Circle = 2 r | Diameter of a Sphere = 2 r |

Circumference Formula | Circumference of a Circle = 2 π r | Sphere does not have the circumference. |

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} |

### Solved Examples

**Q.1: What is the area of a circle whose radius is 3 cm?**

Solution: Given radius of circle, r = 3 cm

Area of circle = π r^{2}

Therefore, Area = π (3)^{2}

A = 9π sq.cm.

**Q.2: What is the area of a ball, whose radius is 5 cm?**

Solution: A ball is a round-shapedobject like a sphere.

Given, the radius of the ball (r) = 5 cm

We know that, area of sphere =4 π r^{2}

Area of the ball with radius 5 cm =4 π 5^{2}

Area = 100π sq.cm.

## Video Lessons on Circles

### Introduction to Circles

### Parts of a Circle

### Area of a Circle

### All about Circles

## Frequently Asked Questions – FAQs

Q1

### Is a sphere two-dimension?

A sphere is a three-dimensional shape which has an area as well as volume.

Q2

### How to find the area of the circle?

If r is the radius of the circle, then we can find its area using the formula: Area = π r^{2}

Q3

### What is the volume of a circle?

A circle does not have volume, it has only circumference and area.

Q4

### What is the equation of circle and sphere?

The equation of the circle is given by (x−a)^{2}+(y−b)^{2}= r^{2}

The equation of sphere is given by (x−h)^{2}+(y−k)^{2}+(z−l)^{2}=r^{2}