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R, S, and T are the vertices of one triangle. E, F, and D are the vertices of another triangle. m

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The two triangles in the problem are congruent to each other. Angle-Side-Angle is the postulate that supports the congruence. The remaining angle which is 80° was determined. Therefore the congruent angles are 60° and 80° while the congruent side is equal to 4.
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User Thoean
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