What is the area formula of sector? Use letters!

The area formula of sector is as follows
S sector = (LR) / 2 (L is sector arc length)
That is arc length * radius / 2
Or s sector = (n / 360) π R ^ 2 (n is the degree of the center angle)
That is, the area of the sector = the area of the circle * the degree of the central angle of the circle / 360

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