A D 3. The Pythagorean Theorem can be proved using similar triangles with this diagram. Which procedure must be done first when proving the Pythagorean Theorem with the diagram? Use the Angle-Angle Similarity postulate to find similar triangles. Substitute the values into the Pythagorean Theorem. Find the corresponding sides of the similar triangles and write proportions. Construct an altitude to hypotenuse c and label it CD.

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