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Circles

These 15 instant maths ideas, ideal for use as starter questions, extension question or probing questions to assess understanding, require students to perform a practical experiment in order to estimate a value for pi, describe a circle over the phone, find a connection between the length of the radius of a circle and the area of the circle, explore different series giving approximations for pi, investigate problems requiring the calculation of circumference and calculate the number of revolutions per minute of a spinning object. The student resource sheets require students to use flow diagrams to calculate areas and perimeters of circles and estimate the area of circles drawn on squared paper.

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