Using a protractor is the simplest way of solving the measurements of angles.
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The 3 interior angles of any triangle add up to 180 degrees
It means to find all of its sides and angles.
By measuring them with a protractor will confirm that the 3 acute angles of a triangle add up to 180 degrees.
You cannot solve a convex polygon! You can solve some questions regarding its angles, or side lengths or area or perimeter. But a convex polygon, in itself, is not something that can be solved!
To solve this, use the fact that the sum of all three angles, in a triangle, is 180 degrees.