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How do you do this problem?

How do you do this problem?-example-1
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User Sarma
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It is helpful to become familiar with the rules for secants of a circle.

The product of the numbers on the same chord is the same.
.. 2*x = 5*8
.. x = 20

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The picture is not drawn to scale. (They almost never are.)
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User Dmitri Snytkine
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