Question

The number of lines of symmetry for a ${50}^{\circ }-{50}^{\circ }-{80}^{\circ }$ triangle is:

Answer 1

The figure is shown in image .

The given triangle is isosceles triangle because $2$ angle $(\angle B=\angle C={50}^o)$ are equal.

Now if we draw the perpendicular bisector of line $BC$ from point $A$, this line $AD$ is known as line of symmetry of the given triangle.