If you are given a picture of a triangle and no information about it, then you could use a protractor.
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Interior angles of a triangle have a sum of 180 degrees.
80 degrees(We're talking strictly about interior angles here.)
An acute triangle is one in which all interior angles are less than 90 degrees.
Interior Angles of a Triangle: 60 Exterior Angles of a Triangle: 120 Interior Angles of a Heptagon 128 (approx) Exterior Angles of A Heptagon 52 (approx) Answer: Triangle
All 3 sides are equal in length and each of the 3 interior angles measure 60 degrees