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A great circle
It's called diameter.
An object that is stationary on the earth's surface moves in a small circle, unless it's on the equator when it moves in a great circle.
Its called CONVECTION or CONVECTION CELL some times
The radius of a circle is the distance from the circle's centre to its circumference
A part of a circle enclosed by two radii is called a sector.
Exactly as in the question and a segment of a circle is the area enclosed by a chord and an arc of a circle.
The line connecting the points is called a chord; the part of the perimeter of the circle enclosed is called an arc; the area between an arc and the chord is called a circular segment.
It is a sector of the circle
Area of a sector of a circle.
A star or enclosed circle
Yes.
The area enclosed by a chord is equal to the area enclosed by a segment minus the area enclosed by the triangle with the same corners as the segment. To visualise it, draw a circle and put a chord on it. Label the chord AB and the centre of the circle C. The area of sector AB equal to the area of sector ABC minus the area of triangle ABC.
It is an ellipse,
It is a sector
Is a SECTOR. or SEGMENT.
A circle with a diameter of 6 units has an area of 28.27 square units.