FORMULABANK

$\mathrm{Area}=\pi \cdot r^2\cdot \frac{v}{360}$

r: radius
v: angle in degrees

$\mathrm{Arc\; Length}=\pi \cdot r\cdot 2\cdot \frac{v}{360}$

$\mathrm{Perimeter}=\pi ·r·2·\frac{v}{360}+2r$

The perimeter is the arc length plus the two sides leading to the arc length.