Circles, Arcs and Sectors

Description

AQA IGCSE Maths (EOY exams yr 8) Flashcards on Circles, Arcs and Sectors, created by Emma Boxley on 06/05/2013.
Emma Boxley
Flashcards by Emma Boxley, updated more than 1 year ago
Emma Boxley
Created by Emma Boxley over 11 years ago
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Resource summary

Question Answer
What is the formula for the area of a circle? pi x radius^2
What is the formula for circumference? 2 x r x pi
What is a sector? It is a portion of a circle.
Whta is a radius? Half the diameter of a circle.
State the formula for the perimeter of a sector. (Ɵ/360x 2 x pi x r) x 2r The part in brackets is the formula to work out the arc length and the 2r represents the sides of the sector.
How do you work out an arc length? (State as a formula) Ɵ/360x 2 x pi x r Ɵ is the angle of the sector.
Ɵ of a sector is 60 degrees. The radius is 8 cm. What is the area of the sector? Ɵ/360 x pi x 8^2= 235cm^2
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