Question

A(n) ______________ triangle always has exactly one line of symmetry.A. isoscelesB. equiangularC. scaleneD. acute

Answer 1

The scalene triangle have no lines of symmetry but have the rotational symmetry of 1.

Similarly, the equiangular and acute triangle does not have only 1 line of symmetry.

In the case of isosceles triangle, the rotational symmetry is 1 and line of symmetry is also 1.

Thus, option A is the correct answer.