Fundamentals of Area and Volume (Leaving Cert Mathematics): Flashcards

Shape where all edge points are equal distance from centre

Distance from centre to edge ($r$)

Distance across circle through centre

Diameter = $2 imes$ radius

$\pi r^2$

$2\pi r$

Slice of circle between two radii and arc

$\frac{x}{360} \times \pi r^2$

$\frac{x}{360} \times 2\pi r$

Fraction of complete circle that sector represents

$\frac{\pi r^2}{2}$

$\frac{\pi r^2}{4}$

Break into simple parts, calculate each, add together