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Need help on this question-example-1
User Airtonix
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The answer that goes in the blank is
\triangle FED

So
\triangle ABC \cong \triangle FED

The order of the letters is important.

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Step-by-step explanation:

The sequence ABC has the letter A go first, B next, then C last. The order is important. This ordering will help us find the answer.

Note that the triangle ABC reflects over a horizontal line so that point A moves to F, point B moves to E, and point C moves to D.

This means that F is the first letter of the answer, E is the next, followed by D last. This means ABC in that exact order corresponds to FED in that exact order.

Therefore, triangle ABC is congruent to triangle FED

We write this as
\triangle ABC \cong \triangle FED

User Terje Nesthus
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