You would add up all the angles.
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because INTERIOR ANGLE 180 AND the exterior angle 180 so 180+180=360
180 degrees. sum of every angle of triangle is always 180..no matter what type of triangle it is.
Angle a plus angle b subtract from 180 equals angle c
triangle sum conjecture is the sum of the measures of the angles in every triangle is 180 degrees
The sum of the angles in a planar triangle, i.e., a triangle where all of the points of the triangle lie in a single plane, is 180 degrees.