Based on the options you provided, since I cannot see the diagram, I can give you reasoning based on common properties associated with the concepts listed:
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Triangle Angle Sum Theorem: This theorem states that the sum of the angles in a triangle is always 180 degrees. This can be proved with a triangle diagram.
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Pythagorean Theorem: This theorem relates the lengths of the sides of a right triangle (a² + b² = c²). It often requires a right triangle in the diagram to be proven.
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Two lines are parallel if they have the same slope: This is a property of lines in coordinate geometry and can be derived from a graph showing two lines with the same slope.
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Alternate interior angles are congruent: This property applies when two lines are crossed by a transversal, and it can often be proved visually if such a transversal is shown in the diagram.
Without seeing the specific diagram, if it includes a triangle, you could prove the Triangle Angle Sum Theorem or perhaps demonstrate properties of angles if there are parallel lines and a transversal. If you provide more details about the content of the diagram or which specific elements are included, I could help further narrow down what can be proved.