MHB Beginner Exercises on Prime numbers and Equality / Inequality proofs

AI Thread Summary
Khan Academy is recommended as a valuable resource for beginner exercises on prime numbers. The platform offers a comprehensive section dedicated to prime numbers, including explanations and practice problems. Users can access interactive content to enhance their understanding of the topic. Additionally, the discussion emphasizes the need for resources on equality and inequality proofs, although specific recommendations for those topics were not provided. Overall, Khan Academy is highlighted as a starting point for learning about prime numbers.
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Does anyone know a good resource for exercises on these topics?
 
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Seemingly by some mathematical coincidence, a hexagon of sides 2,2,7,7, 11, and 11 can be inscribed in a circle of radius 7. The other day I saw a math problem on line, which they said came from a Polish Olympiad, where you compute the length x of the 3rd side which is the same as the radius, so that the sides of length 2,x, and 11 are inscribed on the arc of a semi-circle. The law of cosines applied twice gives the answer for x of exactly 7, but the arithmetic is so complex that the...
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