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I added the choices for the first box as well.

I added the choices for the first box as well.-example-1
I added the choices for the first box as well.-example-1
I added the choices for the first box as well.-example-2

1 Answer

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Looking at the triangles, we see that they have two congruent sides, and the angles between them are congruent too.

Then, the two triangles are related by side-angle-side (SAS), so the triangles are congruent (SAS theorem).

User Alexpghayes
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