If △ ABC ≌ (all equal to) △ DEC what is the value of x?

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If △ABC ≌ △DEC), it means that the two triangles are congruent, implying that all corresponding sides and angles of the triangles are equal. To find the value of (x), you would need to know which sides or angles involve (x) and have the corresponding measures provided.

For example, if we are given:

  • AB = DE
  • BC = EC
  • AC = DC
  • ∠A = ∠D
  • ∠B = ∠ E
  • ∠C = ∠C

And we have an equation involving x based on these correspondences, we can solve for x.

Let’s assume the sides and angles are defined as follows:

  • AB = 2x + 3
  • DE = 7
  • BC = x + 5
  • EC = 12

To solve for x:

  1. Set the corresponding sides equal to each other:
    2x + 3 = 7
  2. Solve for x:
    2x + 3 = 7
    2x = 7 – 3
    2x = 4
    x = 2

Thus, x = 2.

However, the specific equation involving x depends on the provided side or angle measures, so ensure you use the correct correspondence from the given problem statement.