Calculate Area Using Pi

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Geometers find the area of four circles given their circumferences. Circumference is presented in the form of "numeral (diameter) x pi"; the answer key shows solutions as  "numeral (radius squared) x pi," so computation is limited to squaring half the diameter. Once your geometers get this concept, solving the problems is a snap. The resource exercises learners' grasp of the concept (and basic squaring) more than multiplication facts. Space is provided to do the work.

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