Which of the following statements is NOT true about an isosceles triangle? A. An isosceles trianale is a trianale that has at least two sides are conaruent B. The congruent sides of an isosceles triangle are called the legs. C. The angles opposite the congruent sides are the base angles and they are not congruent. D. The angle included by the legs of the isosceles triangle is called the vertex angle