Proposition 2.3.2. Isometries preserve angle measure. In other words, m?ABC = m?A'B'C', where A', B', C' are the images of A, B, C under some isometry. Exercise 2.3.3. Prove the proposition above. Hint: Use congruent triangles.
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Step 1: Start by considering two triangles, ABC and A'B'C', where A', B', C' are the images of A, B, C under some isometry. Show more…
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