120 = 90 + 30
30 = 60/2
you can draw 90°
Draw segment AB
you can draw 90° at A by drawing perpendicular bisector at A
draw equilateral triangle on left side of A will give you 60°
bisect 60° once to give 30°
so total angle is 90 + 30 = 120°
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A 120-degree angle is an obtuse angle, meaning it is greater than 90 degrees but less than 180 degrees. It is formed when two lines intersect and the angle between them measures 120 degrees. In a triangle, a 120-degree angle would typically be found at one of the vertices.
An obtuse angle
An obtuse angled triangle can have can have one internal angle of 120 degrees.
You use a protractor
The supplement to that angle is 60 degrees.