Primary school sector area formula

Primary school sector area formula: s sector = (the square of n π r) /360.

Where n represents the degree of the central angle of the sector, pie represents pi, and R represents radius.

Because the circle is 360 degrees and the sector is a circle with an angle of n degrees, so:

1, n circle (sector) area is:

2. The arc length corresponding to the circle (sector) of n degrees is:

, so,

, turned into an expression,

That is, the sector area is

Extended data:

A sector with an arc of 180 is called a semicircle. Other arc angle sectors are sometimes given special names, including quadrant angle (90), sextant angle (60) and octuple angle (45), which are 1/4, 1/6 and 1/8 of the whole circle respectively.

Components:

1. The part between point A and point B on the circle is simply called "arc" and is pronounced as "arc AB" or "arc AB".

2. The angle centered on the center of the circle is called the "central angle".

3. A statistical chart is a "fan chart".

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