This math topic focuses on practicing the calculation of circle circumferences given their radii. It reinforces understanding of the formula circumference = 2πr, emphasizing mental math skills by advising learners not to use calculators and to approximate π slightly over 3. The topic includes various multi-choice questions where students are required to choose the correct circumference from a set of options. This exercise also fits into a broader introductory unit on the geometry of circle circumferences, suitable for learners aiming to solidify their grasp of basic circle properties.
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Find the circumference without using a calculator. Remember that π is just a bit more than 3.
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