Sectors of circles (AQA GCSE Maths): Flashcards

Portion of circle formed by 2 radii, like a pie slice

Larger portion of the circle

Smaller portion of the circle

$\frac{x}{360°} \times \pi r^2$

$\frac{x}{360°} \times 2\pi r$

Arc length + $2r$

$\frac{x}{360°}$ (where $x$ = angle at centre)

$x = \frac{\text{Area} \times 360°}{\pi r^2}$

$x = \frac{\text{Arc length} \times 360°}{2\pi r}$

$\pi r^2$