To determine what could be proved using a diagram, we would typically need to consider the properties of angles and lines shown in that diagram. However, assuming we're discussing a typical geometry situation involving parallel lines and transversals, here are insights into each option provided:
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Alternate interior angles are congruent: This can be proven using a diagram involving two parallel lines cut by a transversal. If the diagram shows this configuration, then this statement can be proved.
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The Triangle Sum Theorem: This theorem states that the sum of the interior angles of a triangle is always 180 degrees. If the diagram includes a triangle, this theorem can be proved using that triangle.
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The Pythagorean Theorem: This theorem can also be proved if the diagram shows a right triangle, as it fundamentally relates the lengths of the sides in such triangles.
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Two lines are parallel if they have the same slope: This is a property of lines in coordinate geometry. If the diagram includes a representation of lines with equations showing the same slope, this can be proved.
Without seeing the specific diagram in question, it is difficult to definitively determine which statement can be proved. However, if the diagram involves parallel lines and a transversal, then the first statement is the most likely to be provable. If the diagram includes a triangle, then the second statement may apply, and so on for the others depending on the specific features presented in the diagram.