You calculate the remaining degrees by performing 180 minus 108, which equals 72. In these cases, you use the variable to represent both base angles since they are congruent.
Understanding the Isosceles Triangle Angle Sum Property
Angle Type Expression Value Vertex Angle x + 20 40° Base Angle 1 x 80° Base Angle 2 x 80° Algebraic Example Imagine the base angles are both labeled as x, and the vertex angle is described as x + 20. These matching sides create congruent angles opposite them, which are the base angles.
Clarifying this ensures you apply the correct formula and avoid mixing up the angles during calculation. To find these angles, you first identify the vertex angle, which is the angle between the two equal sides.
Understanding the Isosceles Triangle Angle Sum Property
The sum of the interior angles is always 180 degrees, so subtracting the vertex angle from 180 provides the total measure of the two base angles. Using the Vertex Angle The most direct method requires knowledge of the vertex angle.
More About How to find the base angles of an isosceles triangle
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