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.
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The angles add up to 180 degrees on every triangle.
180 degrees
The 3 inside angles of any triangle add up to 180 degrees.
A triangle has 3 inside angles that add up to 180 degrees
The three angles inside the triangle add up to 180 degrees.