I need help with my Geometry. Can you help please?

  • Thread starter Thread starter Some1Udontknow
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Some1Udontknow

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Okay here's the problem:

The radii of two concentric circles are 15 cm and 7 cm. A diameter AB of the larger circle intersects the smaller circle at C and D. Find two possible values for AC.

I guess you're supposed to get 8 and 22 for the two possible values for AC. But I don't understand how you can get that.
 
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