A circle is a set of all points in a plane that are a fixed distance from a center point.
A circle is a closed figure with four equal sides.
A circle is a three-dimensional shape with a circular base.
A circle is an equilateral polygon with infinite sides.
The radius of a circle is the perimeter divided by pi.
The radius of a circle is the distance from the center of the circle to any point on its boundary.
The radius is equal to the square root of the area.
The radius is twice the diameter.
The circumference is π times the radius squared.
C = πr².
C = 4πr.
The circumference of a circle is calculated using the formula C = 2πr, where r is the radius.
The diameter is half the radius.
The diameter is the radius plus the circumference.
The diameter is a straight line passing from side to side through the center of a circle; it is twice the radius.
The diameter is the distance around the circle.
The area of a circle is calculated using the formula A = πr², where r is the radius.
The area is 4πr.
A = 2πr.
Area is calculated as π times the diameter.
A disc is the radius of a circle, extended to infinity.
A disc is the region in a plane enclosed by a circle, including the circle itself.
A disc is only the circumference of a circle.
A disc is a three-dimensional extension of a circle.
A circle is three-dimensional, whereas a disc is two-dimensional.
A circle is a square folded into a circular shape, whereas a disc is not.
A circle refers to just the boundary, whereas a disc includes the circle and all the points inside it.
A circle has a larger area than a disc of the same diameter.
A perfect circle can be drawn using a compass, by fixing one end to the center point and rotating the other end around it.
A perfect circle can be sketched freehand with enough practice.
A perfect circle is x times the radius.
A perfect circle cannot be drawn without a straight edge.
A sector includes the entire circle and its center.
A sector is a part of a disc bounded by two radii and the arc between them.
A sector is a line that does not intersect the circle at any point.
A sector is the longest chord inside a circle.
Arc length is the same as the diameter of the circle.
The length of an arc is determined by the formula L = θ/360° × 2πr, where θ is the angle of the arc and r is the radius.
Arc length is calculated by multiplying the radius by 2 and dividing by π.
Arc length is twice the radius in all cases.
A chord is a radius extended to infinity.
A chord is a line tangent to the circle.
A chord is any line passing through the center of the circle.
A chord is a line segment with both endpoints on the circle.
A tangent line is a line passing through the center of the circle.
A tangent line is any line inside the circle.
A tangent line is a straight line that touches a circle at exactly one point.
A tangent line is a diameter that also serves as the radius.
A small part of a circle is called a circumference.
A small part of a circle created by two radii and an arc is called a 'sector'.
A small part of a circle is called a perimeter.
A small part of a circle is called a diameter.
This is called a 'quadrant'.
This is called a 'sector'.
This is called a 'circumference'.
This region is called a 'segment' of a disc.
The diameter is always equal to the radius.
The diameter is twice the length of the radius.
The diameter is the radius plus the circumference.
The diameter is half the radius.