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If a triangle is not scalene, then the triangle does not have three angles with distinct measures.
If all three angles of a triangle measure less that 90 degrees (if all three angles are acute), the triangle is an acute triangle. A triangle that has a right angle (an angle the measures exactly 90 degrees) is a right triangle. (The other 2 angles will be acute angles.) A triangle that has an angle that is greater than 90 degrees (an obtuse angle), is an obtuse triangle. (The other 2 angles will be acute angles.)
The sum(addition) of the measures of the three angles of a triangle is 180 degrees.
The sum of the three interior angles of a triangle always total 180 degrees.
Use a protractor.("'\(o.o)/"') heheh deal with it!