You can use a formula (equation) or a proportion to find sector area. This video shows to to do both strategies. The final example has you "work backwards" where you are given the sector area and you have to solve for the radius.

This video explains how to find the area of a sector and the length of an arc.



This video is suitable for maths courses around
the world.
KS3 - Not
on your course
GCSE Foundation -
All on your course
GCSE...

This video explains what chords, segments, arc and sectors are. These are all important parts of a circle that you need to know about.



This video is suitable for maths courses around
the world.
KS3 - All
on your...

This video provides an electric presentation on sectors and arc lengths of circles. The presenter explains the key information needed to understand the topic, including the circumference and area formulas of a circle. The presentation...

Essential Definitions for Circles