Area of Sector and Length of Arc (Leaving Cert Mathematics): Flashcards

Slice of circle formed by 2 radii from centre

Curved boundary forming edge of a sector

Shorter arc between 2 points on circle's circumference

Angle at circle's centre between 2 radii

$\frac{\theta}{360°} \times \pi r^2$

$\frac{\theta}{360°} \times 2\pi r$

Central angle in degrees

Radius of the circle

Fraction of complete circle the sector represents

$\frac{1}{4}$

$\frac{1}{2}$

$\frac{\theta}{360°}$