What is the formula for sector perimeter and area?

1. The formula for the perimeter of the fan: c = ( +2)r = l + 2r formula description: l is the arc length of the fan, r is the radius, and it is the radian system.

under the fan-shaped central corner.

Application example: The area formula of the sector arc length is 4, the radius is 4, the perimeter is c=l+2r=122, and the sector is formulated.

s=lr/2

Formula description: s is the area, l is the arc length of the fan, and r is the radius, which is the central angle of the fan under the radian system.

Application example: The arc length of the sector is 4, the radius is 4, and the area is s=lr 2=8

01 The formula for the perimeter of the sector is: the perimeter of the sector = the radius of the sector 2 + the arc length, that is, C=2R+ (N 360) D=2R+(N 180) R. The formula for the sector area is s=(lr) 2 or s=(1 2) r, r is the radius of the bottom circle, l is the arc length of the fan, and is the central angle of the circle.

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). The formula for the perimeter of the sector is: the perimeter of the sector = the radius of the sector 2 + the length of the arc, i.e. c=2r+ (n 360) d=2r+(n 180) r.

The sector area formula describes the relationship between the sector area and the central angle (apex), radius, and the length of the opposite arc. The mathematical formula is expressed as: s fan = (lr) 2 (l is the arc length of the fan) = (1 2) r ( is the central angle expressed in radians).

A fan (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 sector in a larger area. is the angular radian of the fan, r is the radius of the circle, and l is the arc length of the small fan.

A sector with an arc of 180° is called a semicircle. Other fan-shaped arc angles sometimes give them special names, including quadrant angles (90°), sixths (60°), and eighths (45°), which are full 8s, respectively.

Components of the fan:

1. The part between the two points of A and B on the circle is called "arc", referred to as "arc", which is read as "arc ab" or "arc ab".

2. The angle with the center point of the circle is called the "center angle".

3. There is a kind of statistical chart that is the "fan statistical chart"."。

1.The area of the sector = the area of the circle * the degree of the central angle of the circle 360°;

2.The circumference of the sector = diameter + the circumference of the sector * the degree of the central angle of the circle 360°.

The perimeter of the sector should be equal to the arc length plus two radii. The area of the sector is 360 squares of the radius.

The formula for the perimeter of the sector is c=2r+n r 180.

Because the circumference of the fan is equal to the length of the two radii plus the arc length, and the solitary length of the fan is related to the angle of the center of the circle. Therefore, if the radius is r, the central angle of the sector is n degrees, and the circumference of the sector is represented by c. Then the formula for the perimeter of the sector is c=2r+n r 180 or c=2r+2 r n 360.

S fan = (lr) 2 (l is the arc length of the fan) = (1 2) r2 ( is the central angle expressed in radians).

The circumference of the fanThe length of is equal to the length of the arc and the sum of the two radii.

Sector area s= Pi radius r arc length l 2 pi radius = arc length l radius 2.

It is surrounded by two radii and a segment of arcs, and is called a small sector in a smaller area and a large sector in a larger area.

A sector with an arc of 180° is called a semicircle. Other fan-shaped arc angles sometimes give them special names, including quadrant angles (90°), sixths (60°), and eighths (45°), which are full 8s, respectively.

The formula for the perimeter of the fan: the length of the perimeter of the fan is equal to the sum of the arc length and the two radii, p=l+2*r= *r+2*r=r*( r), (p: is the perimeter of the fan, mu closed l:

denotes the arc length of the fan, : denotes the radian of the fan, r: denotes the radius of the circle).

Area formula for a fan.

The area of the sector is equal to the area of the circle.

Multiply by the ratio of the radian angle to 2 (because the area of the sector is proportional.)

At its angle, 2 is the angle of the whole circle), s= *r*r*( 2* )r*r* 2(s: denotes the area of the fan, r: denotes the radius of the circle, : denotes the radian of the fan).

1. Formula for the perimeter of the fan.

Because the fan perimeter = radius 2 + arc length.

If the radius is r, the diameter is d, and the degree of the central angle of the circle opposite the sector is n°, then the perimeter of the sector is: c=2r+(n 360) d=2r+(n 180) r

2. Formula for calculating the sector area.

r is the radius of the fan, n is the number of angles of the arc to the center of the circle, is the pi, you can also divide the area of the circle where the fan is located by 360 and multiply by the angle n of the central angle of the fan

s=nπr^2/360

s=1 2lr (l is the arc length, r is the radius).

s=1/2|α|r squared.

How to find the formula for calculating the perimeter and area of a fan?

1. BAI formula for fan perimeter.

Because the fan-shaped circumference = radius zhi2 + arc length.

If the radius is r, the diameter dao is d, and the degree of shu of the central angle of the fan is n°, then the perimeter of the fan: c=2r+(n 360) d=2r+(n 180) r

2. Formula for calculating the sector area.

r is the radius of the fan, n is the number of angles of the arc to the center of the circle, is the pi, you can also divide the area of the circle where the fan is located by 360 and multiply by the angle n of the central angle of the fan

s=nπr^2/360

s=1 2lr (l is the arc length, r is the radius).

s=1/2|α|r squared.

1. Formula for the perimeter of the fan.

Because the fan perimeter = radius 2 + arc length.

If the radius is r, the diameter is d, and the degree of the central angle of the fan is n°, then the circumference of the fan: c=2r+(n 360) d=2r+(n 180) r

2. Formula for calculating the sector area.

r is the radius of the fan, n is the number of angles of the arc to the center of the circle, is the pi, you can also divide the area of the circle where the fan is located by 360 and multiply by the angle n of the central angle of the fan

s=nπr^2/360

s=1 2lr (l is the arc length, r is the radius).

s=1/2|α|r squared.

If the radius is r and the central angle of the sector is n°, then the perimeter of the sector is

c＝2r＋nπr÷180

Area formula. In a circle with radius r, since the area of the sector opposite the central angle of 360° is the area of the circle s r 2, the area of the sector with the central angle of the circle is n°:

s＝nπr^2÷360

Because the fan perimeter = radius 2 + arc length.

If the radius is r, the diameter is d, and the degree of the central angle of the fan is n°, then the circumference of the fan: c=2r+(n 360) d=2r+(n 180) r

2. Formula for calculating the sector area.

r is the radius of the fan, n is the number of angles of the arc to the center of the circle, is the pi, you can also divide the area of the circle where the fan is located by 360 and multiply by the angle n of the central angle of the fan

s=nπr^2/360

s=1 2lr (l is the arc length, r is the radius).

s=1/2|α|r squared.

Solution: Area s=(a2)*r2 (a is the angle of the sector).

Circumference c=a*r (a is the angle of the sector).

The formula for the area is n/360 pi r*2

The formula for perimeter is n pi r + 2r at 360ths

The formula for the perimeter of the sector is: the perimeter of the sector = the radius of the sector 2 + the arc length, that is, c=2r+ (n 360) d=2r+(n 180) r.

The formula for the area of the hail is s=(lr) 2 or s=(1 and 2) r, r is the radius of the base circle, and l is the length of the fan-shaped arc, which is the central angle of the circle.

Sector: The figure composed of an arc and the two radii passing through the end of the arc is called a fan If the radius of the circle is r, and the area of the fan with the central angle of the circle is n°, then .

s sector = n r2 360 (sector area formula) If the radius of the circle is r, and the arc length opposite the central angle of n° is l, then l = n r 180 (arc length formula).

Then, the circumference of the sector is c=l+2r