# What is the exact radius of the earth?

## What is the exact radius of the earth?

The radius of Earth at the equator is 3,963 miles (6,378 kilometers), according to NASA’s Goddard Space Flight Center in Greenbelt, Maryland. However, Earth is not quite a sphere. The planet’s rotation causes it to bulge at the equator. Earth’s polar radius is 3,950 miles (6,356 km) — a difference of 13 miles (22 km).

## What is the radius of the earth in meters in scientific notation?

6371km

It is known that the equatorial radius of the earth is R=6371km R = 6371 k m so, convert the unit of radius using the conversion factor.

**How is Earth radius measured?**

Since the locations are points on a circle that goes around the earth, the distance between them can be expressed as an arc measurement on a 360-degree circle. For Eratosthenes, the arc was 7.2 degrees. Compute the radius of the earth using the formula C (circumference) = 2 x pi x r (radius).

**What is the radius of Earth in power?**

The Earth’s mean radius is determined as the average distance from the physical center to the surface, based on a large number of samples. The value, symbolized rearth, is equal to approximately 6,371,000 meters (6.371 x 106 m). This is roughly 6,371 kilometers (km) or 3,960 statute miles.

### What is true shape of the earth?

The oblate spheroid, or oblate ellipsoid, is an ellipsoid of revolution obtained by rotating an ellipse about its shorter axis. It is the regular geometric shape that most nearly approximates the shape of the Earth.

### What is the mass of Earth in KG?

5.972 × 10^24 kg

Earth/Mass

**Who invented radius?**

Eratosthenes of Cyrene

Eratosthenes of Cyrene (/ɛrəˈtɒsθəniːz/; Greek: Ἐρατοσθένης [eratostʰénɛːs]; c. 276 BC – c. 195/194 BC) was a Greek polymath: a mathematician, geographer, poet, astronomer, and music theorist.

**What is the radius of Earth Class 7?**

The radius of the earth is 6,371 km. Its equatorial radius is 6378 km, but its polar radius is 6357 km – in other words, the Earth is slightly flattened.

#### How 9.81 is calculated?

The acceleration g=F/m1 due to gravity on the Earth can be calculated by substituting the mass and radii of the Earth into the above equation and hence g= 9.81 m s-2.

#### Is value of G actually constant?

In every place of both Earth and the universe, the value of G remains constant. The value of G does not change with a change in the height, and depth from the earth’s surface.

**Is the shape of the Earth geoid?**

The geoid is a shape like the surface of the Earth. It is a 3-D geometrical shape like an orange. Shapes of this kind are called oblate spheroids, which is a kind of ellipsoid. The geoid, however, is a very special kind of oblate spheroid.