Area — Circles (AQA GCSE Maths): Quizzes

Radius is half the diameter

$A = \pi r^2$

$C = 2\pi r$

$\pi \approx 3.142$

A portion bounded by two radii & an arc

Major sector

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

$\frac{x}{360} \times$ circumference

Calculate the sector area

Curved arc and straight diameter