Area of a circle (Edexcel GCSE Maths): Flashcards
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Practise the cards
12 cards from this deck
Formula for area of a circle
Formula for area of a circle
What represents in
What represents in
Area
What represents in
What represents in
Radius of the circle
Definition of radius
Definition of radius
Distance from centre of circle to any point on its edge
Relationship between radius and diameter
Relationship between radius and diameter
Radius is half the diameter
What to do if given diameter not radius
What to do if given diameter not radius
Divide it by 2 to find the radius
Definition of diameter
Definition of diameter
Distance across the full width of the circle
Formula for area of a semicircle
Formula for area of a semicircle
rac{1}{2} imes pi imes r^2
Most common mistake with circle area
Most common mistake with circle area
Using diameter instead of radius in the formula
Units for area of a circle
Units for area of a circle
Square units
Best way to input on calculator
Best way to input on calculator
Use the π button for accuracy
Why small radius changes cause large area changes
Why small radius changes cause large area changes
Radius is squared in the formula