Is the circle fan shaped? Is the circle fan shaped?

The circle is fan-shaped. I think LZ thinks that the general fan shape has two straight edges and no circle, so I don't understand.

In fact, the definition of a fan is a figure surrounded by an arc and two radii.

Boundaries are only used to qualify and represent the graph.

So it doesn't say that it has to be straight.

It is possible to think in terms of differentiation.

A fan is a figure consisting of several adjacent radii of a circle.

Of course, it is also possible to form a fan from all the radii of a circle.

No. Sector definition: A shape enclosed by an arc and two radii passing through both ends of the arc is called a fan.

A fan is a part of a circle.

The fan is an important figure related to the circle, and its area is related to the central angle (top angle) and the radius of the circle, the central angle of the circle is n°, and the area of the fan with the radius r is n 360* r 2. If its apex angle is in radian units, it can be simplified to 1 2 radians radius squared.

The circle is a special fan, which is a fan with a 360-degree angle at the center of the circle.

It's like a square is a rectangle of equal length and width.

The "two sides" refer to those two radii.

Yes, that's right, it's the coincidence, so this situation is very special.

Be. A circle is a special type of fan.

Definition of a fan: A figure enclosed by the two sides of the corner of the vertex at the center of the circle and a section of the arc truncated on both sides.

Therefore, when the central angle of the circle is 360 degrees, it becomes a special fan-circle.

Yes, a circle is a special type of fan.

No. A circle is not a fan, and the definition is different (although it can be understood that a circle is the limit of a fan).

A circle is the set of all points (considering planes) at the same distance from a fixed point. (Space is a ball).

The fan defines an arc and the shape enclosed by two radii passing through both ends of the arc is called a fan (the combination of a semicircle and a diameter is also a fan).

So it doesn't say that it has to be straight.

It is possible to think in terms of differentiation.

A fan is a figure consisting of several adjacent radii of a circle.

Of course, it is also possible to form a fan from all the radii of a circle.

A sector is a figure enclosed by the two radii of the central corner and the arc of the central corner. Figuratively speaking, it is two line segments and an arc (curve) that encloses a fan.

Sector definition: The shape enclosed by an arc and two radii passing through both ends of the arc is called a fan (the combination of a semicircle and a diameter is also a fan). Obviously, it is made up of a part of the circumference of the circle and the central angle to which it corresponds.

Geometry Primitives defines a sector as a figure enclosed by vertices on either side of the corner of the center of the circle and a section of the arc truncated on both sides.

The formula for the area of a fan: S fan (lr) 2 (l is the arc length of the fan, r is the radius of the fan), similar to the area calculation of a triangle; or sash (n 360) r 2 (n is the degree of the central angle).

The basic properties of a sector are:

1.Any point from vertex to edge is equal.

2.The area formula s=1 2lr, where r is the radius and l is the arc length.

3.The midpoint and vertex of the arc connect the lines that bisect the other two points perpendicularly.

4.The special property of the sector is that the area of the sector can be used to represent the percentage of the part in the population, and the size of each set of data relative to the total number can be displayed.

The circle belongs to the fan-shaped. The circle is a special fan. In a plane, a closed curve formed by a moving point centered on a certain point and rotated once at a distance of a certain length is called a circle.

Sector refers to a circular arc and two radii through both ends of the arc to form a figure, the combination of semicircle and diameter is also a fan, it is a part of the circumference of the circle and its corresponding central angle enclosed, is a vertex at both sides of the corner of the center of the circle and these two sides of the arc enclosed by a figure. So, the circle is a special fan.

Appendix, A circle is a geometric figure. By definition, a circle is usually drawn with a compass. The diameter and radius length of the circle within the same circle are always the same, and the circle has an infinite number of radii and an infinite number of diameters.

A circle is an axisymmetric, center-symmetrical figure. The axis of symmetry is the straight line where the diameter is located. At the same time, the circle is a "positive infinite polygon", and "infinity" is just a concept.

When the polygon has more sides, its shape, circumference, and area are closer to a circle. So, there is no real circle in the world, and the circle is really just a conceptual figure.

The semicircle is fan-shaped, which is a special fan-shaped. The whole circle is also a special fan. Geometry Originals

Definition of : The figure enclosed by the two sides of the corner of the vertex at the center of the circle and a section of the arc cut on both sides is called a fan, so the semicircle is also a fan.

The shape enclosed by an arc and two radii passing through both ends of the arc is called a fan (the combination of a semicircle and a diameter is also a fan). Obviously, it is made up of a part of the circumference with the central angle to which it corresponds.

Fence into. Sector (symbol: ?.)) is a part of a circle, enclosed by two radii and a segment of arcs, and is called a small sector in a smaller area, and a large area is called a large sector.

The shape of an arc and the two radii that pass through each end of the arc is called a fan.

A fan, also known as a fan, is a special shape on a circle, which refers to a figure composed of an arc and two radii of the end of the arc. The angle between the two radii of a sector is called a sector angle. The sector formed by the radius of the inferior arc and its end point is called the inferior sector; The fan formed by the radius of the optimal arc and its end point is called the optimal fan; The sector with a right-angled angle is called a right-angle sector to shield the dust.

Calculation formulaSector area s = absolute value of the arc of the round brother pin|a|Radius r 2.

The absolute value of the radian of the center of the circle|a|= sector area S2 radius r.

Arc length l = absolute value of radian in the center of the circle|a|Radius macro old r.

Sector area s = arc length l radius r 2.

Arc length l=2 Angle of the central angle (angle system) Pi Radius 360°.

Arc length l = angle of the central angle (angle system) pi radius 180°.

A semicircle is a part sandwiched between two circular radii, which conforms to the definition of a fan, and it has all the properties of a fan, so the semicircle belongs to a fan.

The formula for calculating a semicircle is:

1) The area of the semicircle Pi and the square of the radius 2

Letter formula: s semicircle = r 2

2) Circumference of a semicircle = pi radius + diameter.

Letter formula: c= r+d

1. The area of the semicircle: s semicircle = (r 2) 2. (r is the radius).

2. The area of the ring: S big circle - S small circle = (r 2-r 2) (r is the radius of the large circle, r is the radius of the small circle).

3. The circumference of the circle: c=2 r or c=d. (d is the diameter, r is the radius).

4. The circumference of the semicircle: d+(d) 2 or d+ r. (d is the diameter, r is the radius).

5. The arc length of the sector l=the central angle (radian) r=n r 180 (the central angle) (r is the radius of the fan).

No, fan-shaped, a part of a circle composed of the angle of the center of the circle to which it is opposite. (The combination of a semicircle and the diameter is also a fan) The meaning of the fan The figure enclosed by an arc and two radii passing through both ends of the arc is called a fan, so it is not!