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  1. WHAT ARE CIRCLES?
  2. WHAT IS RADII?
  3. WHAT RADIUS OF OUR EARTH?

1.circle is circle 2.radii is radii 3.?????

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A circle is is a type of shape. it is almost like a sphere.Radii is the plural of radius.

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earth is not a shape.......huh.........its a planet and its 3D.....not a pic drawn on paper !!!!

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CIRCLE : A circle is a plane figure contained by one line such that all the straight lines falling upon it from one point among those lying within the figure are equal to one another.

RADII : The distance from the center of a circle to a point on its circumference. The plural term for "radius" is "radii."

REDIUS OF OUR EARTH :

Earth
The average radius of the Earth, or the distance from the center to surface is 6,371 km, or 3,959 miles.

But wait, the answer is actually a little more complicated than that. As you probably know, the Earth is rotating on its axis, completing one full revolution in just less than 24 hours. This relatively rapid rotation causes the Earth’s poles to flatten, and our planet bulges at the equator. Instead of a perfect sphere, the Earth is a flatted sphere.






This means that the distance from the center to the equator is further than the distance from the center to the Earth’s poles. The equatorial radius of the Earth is 6,378.1 km, and the the polar radius of the Earth is 6,356.8 km. Subtract those two numbers and you get 21.3 km. In other words, points on the equator are actually 21.3 km further from the centre of the Earth than the poles.

This is why I said at the top of this article that the average radius of the Earth is 6,371 km.

One of the interesting implications of this is that the point most distant from the center of Earth is actually Mount Chimborazo in Ecuador. It’s 6,267 meters tall, but it’s very close to the equator, while Mount Everest (although taller), is more distant. Mt. Chimborazo is 6,384.4 km from the Earth’s center, while Mt. Everest is only 6,381.7 km from the center. Mt. Chimborazo is a little less than 3 km further from the center of the Earth than Mt. Everest.

We have written many articles about the Earth for Universe Today. Here’s an article about the circumference of the Earth, and here’s one about the diameter of the Earth.

Want more resources on the Earth? Here’s a link to NASA’s Human Spaceflight page, and here’s NASA’s Visible Earth.

We have also recorded an episode of Astronomy Cast about Earth, as part of our tour through the Solar System – Episode 51: Earth.

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I thought you got the answere.

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 i donot no

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radius of the earth is 6,371 km
simple!!!!!!!!
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circles are shapes which look like a sphere, and radii is plural of radius. radius means half of a diameter.
 
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Earth radius is the distance from Earth's center to its surface, about 6,371 kilometers (3,959 mi). This length is also used as a unit of distance, especially in astronomy and geology, where it is usually denoted by 
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A circle is a simple shape in Euclidean geometry. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant. The distance between any of the points and the centre is called the radius.
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In classical geometry, the radius of a circle or sphere is the length of a line segment from its center to its perimeter. 
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a circle is atype of shape( around shape) likeO
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Circle is a shape . The line onwards the centre of the circle is called radii.
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check on google
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same as subhra
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radii is a half of a circle
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A circle is a simple closed shape. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant
In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel
6,371 km
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Please find this answer

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1. circles answer =
A circle is a simple closed shape. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant.
2.radii answer=
In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel. 
3.rradius of our Earth answer=
The radius of Earth at the equator is 3,963 miles (6,378 kilometers), according to NASA's Goddard Space Flight Center. 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).
 
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its a sphere
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this is a circleImage result for circle
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Hi!
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The radius of earth is 6,371 km
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circle's definition 
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radius
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u have got the answer
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