Question

An isolated triangle has an angle that measures 140° which other angles could be in that isosceles triangle

Answer 1

Given the triangle is isosceles,

$\begin{gathered} \angle A+\angle B+\angle C=180^{\circ} \\ 2\angle A+140^{\circ}=180^{\circ} \\ 2\angle A=180-140 \\ 2\angle A=40 \\ \angle A=\frac{40}{2} \\ \angle A=20^{\circ} \end{gathered}$