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Circle O is tangent to AB at A, and angle ABD = 90 degrees. If AB = 12 and CD = 28, find the radius of the circle.

 

 Nov 4, 2020
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AB2 = BC * BD               BC = 4.43908

 

AD = sqrt(AB2 + BD2)

 

angle BDA = arctan(AB / BD)

 

r = (AD/2) / cos∠BDA

 Nov 5, 2020

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