Protractor, Inclinometer (often shortened to Clinometer), Theodolite.
You could also add Compass and Sine Bar (though the latter really sets rather than measures an angle).
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The 3 interior angles are 90 degrees, 45 degrees and 45 degrees
Yes, congruent angles are angles that have the same measure.
3 angles
Triangles have 3 interior angles that measure 180 degrees total.
The 3 interior angles of any triangle add up to 180 degrees and the 3 exterior angles add up to 360 degrees