Name __________________________________________                         Date ____________Polizzi/Denman                   ...
Area of a circle• Area: the number of square units inside that circle.A = π R²                   A = π R²                 ...
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Study Guide for Circles

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Study Guide for Circles

  1. 1. Name __________________________________________ Date ____________Polizzi/Denman Math – 6 Study Guide CirclesTopics on Quiz: 1. Circumference of a circle 2. Area of a circleDiameter: Line segment from arc to arc through the midpoint of the circle. Diameter is twicethe radius.Radius: ½ the diameter of a circle, it’s a line segment from midpoint on the circle to the arc.Chord: Line segment from arc to arc but not through the midpoint of the circle. Circumference of a circle• Circumference: the distance around a circle (outside).C=2π R C=2πR = 2 (π) (2) =4π • If the circle shows the diameter, you need to take half to find the radius. C=2πR = 2 (π) (1.5) =3π
  2. 2. Area of a circle• Area: the number of square units inside that circle.A = π R² A = π R² = π (3) 2 =9π • If the circle shows the diameter, you need to cut it in half to find the radius. A = π R² = π (4) 2 = 16 π

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