How many lines of symmetry does an isosceles triangle have?
A triangle with two sides of equal length is an isosceles triangle
Answer: An isosceles triangle has 1 line of symmetry.
The triangle also has 2 equal interior sides.
A triangle is only said to be an isosceles triangle if it has 2 equal sides. Therefore, every isosceles triangle by definition has 1 line of symmetry. It can be drawn by joining the vertex between equal sides and the midpoint of the opposite side.
Hence, an isosceles triangle has 1 line of symmetry.