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| Math Central | Quandaries & Queries |
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Question from Arman: Two concentric circles have their centre's at point C. The radius of the smaller circle is 8 cm. The length of chord AB is 26 cm and is tangent to the smaller circle. What is the circumference of the larger circle? |
Hi Arman,
I drew a diagram of what you described and added a point $D$ where the chord is tangent to the smaller circle.
It looks like $D$ is the midpoint of $AB.$ Can you prove that it is? What is the length of $AC?$
Penny
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