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180 Proof: 30-60-90 Triangle 45-45-90 * * * * * The answer is correct, but two examples (or even a million) do not constitute mathematical PROOF.
The proof would finish with the statement:"Therefore, bc is congruent to de".
Equilateral means 'same length' - Therefore if the length of each side in a triangle are the same, each angle MUST also be the same.
The answer to this question is Two segments that are both congruent to a third segment must be congruent to each other All of the radii of a circle are congruent You're welcome.
Two sides and two interior angles will be congruent while the other side and interior angle will be different.