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Find the length of ST.

Find the length of ST.-example-1
User Jirimertin
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You may recognize QRT as a 5-12-13 right triangle. That would make
.. ST = 13 -5 = 8

The other way to get there is using the rules for secants.
.. 12^2 = ST*(ST+10)
You will find that ST = 8 is a solution to this quadratic. (The other, extraneous, solution is ST = -18.)
User Betaveros
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