All triangles add up to 180 degrees it depends which triangle.
An equilateral has all angles the same (60).
An isosceles has the two bottom angles the same.
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Infinitely many. Having found one triangle, you can find infinitely many similar triangles.
To find interior angle measurements, you must divide the shape into triangles by drawing diagonal lines. The diagonal lines draw triangles, and the interior angle measure of triangles are always 180 degrees. The sum of interior angles of an octagon is 1080 degrees. How ever many triangles you have, multiply it by 180. See octagons in the link for more help,
A hexagon has 6 triangles inside of it. If one triangle equals 180 degrees and there are 6 triangles. 180 degrees *6 triangles=1080 degrees.
Triangles can only have an internal angle sum of 180, if you have two angles at 90 degrees, their sum would be 180 leaving no more degrees to create the last angle.
triangles always have 180 degrees in total. So the degrees for the final angle would be 180 - 93 - 63.