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Who told me that the formula of the ninth grade mathematics arc length and fan area should be complete? Thank you.
The arc length formula of the sector =2*3. 14 16* radius * central angle /360= radius * central angle (radian).

Sector area formula =3. 14 16* radius * central angle /360=0.5* arc length * radius.

Conversion formula between area and arc length: arc length = area /(0.5* radius)

The developed formula of arc length of conical profile =2* base circle radius *3. 14 16= conical profile length *2*3. 14 16* sector central angle /360.

Lateral area formula of cone = cone side length * cone side length *3. 14 16* sector central angle /360.

Formula of total area of cone = = cone side length * cone side length *3. 14 16* sector central angle /360+ bottom radius *3. 14 16.

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