Say that the angles all equal 90 degrees and that all sides are equal in length.
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Use squares and try it out for yourself. Get a number of squares and make a rectangle 3 squares long by 4 squares wide. Count the squares. You should have 12 squares (or 3*4). That's the best way I know to prove the formula.
Squares and circles are always similar.
You would use the AA Similarity Postulate to prove that the following two triangles are similar. True or false?
You can't use AAA to prove two triangles congruent because triangles can have the same measures of all its angles but be bigger or smaller, AAA could probably be used to prove two triangles are similar not congruent.
By enlargement on the Cartesian plane and that their 3 interior angles will remain the same