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In the diagram, AE¯¯¯¯¯¯¯¯ is tangent to the circle at point A, and secant DE¯¯¯¯¯¯¯¯ intersects the circle at points C and D. The lines intersect outside the circle at point E.
A circle with no center shown. Points A, C, and D lie on the circle. Tangent A E and secant D E are as described in the text. Segment A E equals 12, segment E C equals 8, and segment C D equals x plus 10.

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What is the length of ED¯¯¯¯¯¯¯¯?
21
23
20
18
could somebody help im really stuck on this one

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nini

  1. So am I. What is x about?

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    Damon

  2. Recall the secant-tangent theorem, and you have
    EA^2 = EC*CD
    12^2 = 8*(x+10)
    and now ED = EC+CD = 8+x+10

    I suspect a typo somewhere in the murk above

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    oobleck

  4. 18

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    nathalee

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