Answer:
50°
Step-by-step explanation:
In an isosceles triangle, the base angles are equal and the vertex angle is 80°. Let x° be the measure of each of base angles.
In a triangle, the sum of the measures of all interior angles is always 180°, then
[tex]x^{\circ}+x^{\circ}+80^{\circ}=180^{\circ}\\ \\2x^{\circ}=180^{\circ}-80^{\circ}\\ \\2x^{\circ}=100^{\circ}\\ \\x^{\circ}=50^{\circ}[/tex]
