The instrument for measuring the angles of a triangle is called a protractor.
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for two similar triangles , their corresponding angles are equal.
Classifying triangles is a great skill to know.Acute Triangles: These are triangles with measures lessthan 90 degrees.Obtuse Triangles: Any triangle with measures greater than 90 Degrees.Right Triangle: Any triangle with a Right Angle (exactly 90 degrees)
ruler
Yes - in the case of triangles in Euclidian geometry. That is, basically triangles in a plane.
Protractors