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The two triangles below are congruent such that . Make a sketch of the triangles on your paper and then label all three sides and all three angles. Note: The triangles are not drawn to scale.

Pay attention to the order of the letters in the congruence statement.
Review the Math Notes box in section 7.1.4.
Since is a right triangle, you can use the Pythagorean theorem to solve for side .

Which side corresponds to ? ?