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Mathematics 9 Online
OpenStudy (chupacabraj):

What does the "r" mean in this question (I already solved the question w/o understanding the significance of r though lol)

OpenStudy (chupacabraj):

OpenStudy (chupacabraj):

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OpenStudy (chupacabraj):

|dw:1473606411219:dw| What is it? Also, what does "concentric" mean?

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