Because the total sum of angles in any triangle adds up to 180 degrees.
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60° The angles of a triangle sum to 180°. In an equilateral triangle the three angles are all the same. Thus each angle of an equilateral triangle is 180° ÷ 3 = 60°
all triangles equal 180 degrees so 180/3 equals 60 so, the measure of each angle of an equilateral triangle is 60 degrees.
Each angle to an equilateral triangle is 60 degrees and can be worked out by dividing 180 degrees (the sum of all angles) by 3.
Each angle is 60 degrees. (180/3)
The internal angles of a triangle add up to 180 degrees so in an equilateral triangel each internal angle must be 60 degrees, as 3 x 60 = 180.