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How do I answer this and what theorem do I use? (Geometry)

How do I answer this and what theorem do I use? (Geometry)-example-1
User FalcoB
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If 2 tangents are drawn to a circle from the same exterior point, they are congruent. So TR = WR, which means that 7k - 19.4 = 48.5. Solving for k gives you 9.7 for k

User Vlad Iobagiu
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