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JValdron · Answer 1 · 2024-09-11T22:23:15+0000

Answer:

√429.

Explanation:

Triangles BCD and ABC are similar, so corresponding sides are in the same ratio, so:

x/ AC = DC/x

x/39 = 11/x

x^2 = 11*39

x^2 = 429

x = √429