The correct answer is:
$\displaystyle \dfrac{P}{720}$​ 2πR²
Explanation:
Sector angle is p in degrees
Radius of the Circle = R
Area of the sector = $\displaystyle \dfrac{πR²}{360°}$ = ​$\displaystyle \dfrac{(πR²p)²}{720°}$​ = $\displaystyle \dfrac{P}{720}$​ 2πR²