Math Arguments

Problems, Questions, and Puzzles to spark discussion and argument in the maths classroom.

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Item 808

Area of a Ring

Area of ring between 2 concentric circles = 18π. If a chord of the larger circle is tangent to the smaller, what is the length of the chord?

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David Marain
GEOM

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A classic... Area of ring between 2 concentric circles = 18π. If a chord of the larger circle is tangent to the smaller, what is the length of the chord?
— David Marain (@dmarain) November 21, 2020

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