Dividing this result by two gives the measurement of a single base angle. Using the Vertex Angle The most direct method requires knowledge of the vertex angle.
Isosceles Triangle Base Angles Variable Method
Identifying the Base Correctly A common point of confusion is determining which side is the base. Subtracting 20 results in 3x = 160, and dividing by 3 reveals x is approximately 53.
Working with Missing Angles Sometimes the vertex angle is not given, but the base angles are expressed as variables. For example, if the vertex angle is 40 degrees, the base angles sum to 140 degrees.
Isosceles Triangle Base Angles Variable Method
Consequently, the base angles are roughly 53. Splitting 140 by 2 yields 70 degrees for each base angle.
More About How to find the base angles of an isosceles triangle
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