# What is circumference of sphere?

## What is circumference of sphere?

In sphere. The circumference is the length of any great circle, the intersection of the sphere with any plane passing through its centre. A meridian is any great circle passing through a point designated a pole.

### Why is it called a Spherometer?

A spherometer basically is a precision instrument to measure very small lengths. Its name reflects the way it is used to measure the radii of curvature of spherical surfaces. It is based on the principle of screw.

**What is a Spherometer used for?**

Any surface that is curved has a radius of curvature, the radius of the sphere that approximates the surface locally. Thus a spherometer can measure the radius of curvature of an item such as a lens and curved mirrors that are spherical in shape.

**How least count is determined?**

The Vernier caliper least counts formula is calculated by dividing the smallest reading of the main scale with the total number of divisions of the vernier scale.LC of vernier caliper is the difference between one smallest reading of the main scale and one smallest reading of vernier scale which is 0.1 mm 0r 0.01 cm.

## What does curvature mean?

1 : the act of curving : the state of being curved. 2 : a measure or amount of curving specifically : the rate of change of the angle through which the tangent to a curve turns in moving along the curve and which for a circle is equal to the reciprocal of the radius.

### What is curvature formula?

If a curve is given by the polar equation r=r(θ), the curvature is calculated by the formula. K=∣∣r2+2(r′)2−rr′′∣∣[r2+(r′)2]32. The radius of curvature of a curve at a point M(x,y) is called the inverse of the curvature K of the curve at this point: R=1K.

**What is another word for curvature?**

What is another word for curvature?

arc | bend |
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curving | angle |

arch | bow |

crook | curvity |

deflection | flexure |

**What is positive curvature?**

A surface has positive curvature at a point if the surface curves away from that point in the same direction relative to the tangent to the surface, regardless of the cutting plane. Thus the top of your head, the end of your finger, or the inside of your armpit are points of positive curvature.

## How do you calculate curvature of a line?

- Step 1: Compute derivative. The first step to finding curvature is to take the derivative of our function,
- Step 2: Normalize the derivative.
- Step 3: Take the derivative of the unit tangent.
- Step 4: Find the magnitude of this value.
- Step 5: Divide this value by ∣ ∣ v ⃗ ′ ( t ) ∣ ∣ ||\vec{\textbf{v}}'(t)|| ∣∣v ′(t)∣∣

### What is the radius of a curvature?

In differential geometry, the radius of curvature, R, is the reciprocal of the curvature. For a curve, it equals the radius of the circular arc which best approximates the curve at that point. For surfaces, the radius of curvature is the radius of a circle that best fits a normal section or combinations thereof.

**How do you calculate the curvature of a sphere?**

At the point on the ellipse (x,y) = (a\cos \theta, b\sin\theta) with (a=6,\ b=3), the curvature is given by {ab\over (a^2\sin^2 \theta+ b^2\cos^2 \theta)^{3/2}}. A perfect sphere has constant curvature everywhere on the surface whereas the curvature on other surfaces is variable.

**What is the curvature of a sphere?**

The Gaussian radius of curvature is the reciprocal of Κ. For example, a sphere of radius r has Gaussian curvature 1r2 everywhere, and a flat plane and a cylinder have Gaussian curvature zero everywhere. The Gaussian curvature can also be negative, as in the case of a hyperboloid or the inside of a torus.

## What is unit of curvature?

Here are several reasons why this makes sense. Let’s measure length in meters (m) and time in seconds (sec). Then the units for curvature and torsion are both m−1. Explanation #1 (quick-and-dirty, and at least makes sense for curvature): As you probably know, the curvature of a circle of radius r is 1/r. = m−1.

### Does a sphere have a curved surface?

A sphere has no edges and therefore no corners. It has one curved face that goes all the way around.

**Does a sphere have a circle face?**

What about their faces? A sphere has no faces, a cone has one circular face, and a cylinder has two circular faces. Therefore, the number of faces increases by one from one figure to the next.

**Does a sphere have a surface?**

A sphere has only curved surface, no flat surface, no edges and no vertices.

## Does a sphere have a surface area?

The Greek mathematician Archimedes discovered that the surface area of a sphere is the same as the lateral surface area of a cylinder having the same radius as the sphere and a height the length of the diameter of the sphere. The lateral surface area of the cylinder is 2πrh where h=2r .

### What is the difference between the surface area of a sphere and hemisphere?

The curved surface area = 2πr2 square units. Substitute the value of r in the formula. Therefore, the curved and the total surface area of the hemisphere are 100.48 and 150.72 cm2, respectively….

Related Links | |
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Surface Area Of A Cone | Surface Areas and Volume |

Volume Of Sphere | Volume of Hemisphere |

**What is a formula of cylinder?**

The formula for the volume of a cylinder is V=Bh or V=πr2h . The radius of the cylinder is 8 cm and the height is 15 cm. Substitute 8 for r and 15 for h in the formula V=πr2h . Therefore, the volume of the cylinder is about 3016 cubic centimeters.

**Which of the following is an example of a sphere?**

From the given options, ball is an example of a sphere.

## How many sides has a sphere?

two sides

### Does a sphere have 1 side?

A sphere has no sides at all. It has an infinite number of infinitesimally small surface areas, if you will. A sphere has an inner and an outer surface.

**Is a circle the same as a sphere?**

Definition of Circle and Sphere A Circle is a two-dimensional figure whereas, a Sphere is a three-dimensional object. 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.

**Does a sphere have a face or a surface?**

A Sphere has no faces. According to the QCA definition, a face is the flat surface on a shape. It may be possible to suggest that a sphere has 1 curved face but as ‘face’ means flat surface then it clearly has none.