The triangles are congruent by SAS congruence theorem
How to determine the congruence theorem?
From the figure, we have the following congruent sides
- Sides AB and DB
- Sides A F and D F
Also, both triangles share a common vertex at B
This means that:
<B = <B
Two sides and one angle are congruent in the triangles
Hence, the triangles are congruent by SAS congruence theorem
Read more about congruence theorem at:
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