isosceles triangle

In the isosceles triangles ABC and CDE below, BC = 16 in., DE = 11 in. What is CD - AD? https://www.d2l.mvps.mde.k12.ms.us/c.../quiz5b_q4.gif

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Hello, sanee66!

Quote:

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In the isosceles triangles and below,
. .
What is ?

Code:

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            A
            *
          *  *  D      11
          *      *  *  *  *  * E
        *          *          *
        *              *      *
      *                  *  *
    B *  *  *  *  *  *  * C
                16

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We have: .
. . . .and: .

Hence: .

Therefore: .