Using the triangle theorem and the property of an isosceles triangle, another angle which could be in the triangle is 40°
Since one of the measure of the angles is 80°
Recall :
- Base angles of an isosceles triangle are equal.
Hence, the sum of the angles in the isosceles triangle can be expressed thus :
- 80 + 2(x) = 180° (sum of angles in a triangle)
80 + 2x = 180°
2x = 180 - 100
2x = 80
x = 80/2
x = 40°
Therefore, another angle which could be in the triangle is 40°
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