What does the following formula tell us about a circle? Πr
  • Its circumference
  • Its area
  • Its diameter
  • Its volume
What do we call a line which joins two points on the edge of a circle but does not pass through its centre?
  • Diameter
  • Sector
  • Chord
  • Arc
What is the value of π to four decimal places?
  • 3.1425
  • 3.1415
  • 3.1416
  • 3.1419
We use a Greek letter π to help us work formulae for circles. What is its name?
  • Pi
  • Alpha
  • Phi
  • Gamma
What is the name of a shape that forms half a circle?
  • A moon
  • A hemi-circle
  • A demi-circle
  • A semi-circle
What is the formula to calculate the circumference of a circle?
  • Π x radius
  • Π x diameter
  • Π x radius2
  • Π x diameter2
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