Geometry 1. the vertex angle of an isosceles triangle is always acute. (true/false) 2. the base angles of isosceles triangles are always complementary.(true/false) 3.all of the sides of an isosceles triangle are always congruent. (true/false) i think the first one would be true, second true, and third one would be need confirmation

1. The vertex angle of an isosceles triangle is always acute: FALSE, since it can be acute or obtuse

2. The base angles of isosceles triangles are always complementary: FALSE, it's true ONLY in an isosceles RIGHT ANGLE triangle, where the angle at the base each equal 45°

3.All of the sides of an isosceles triangle are always congruent: FALSE, all sides are all congruent in an EQUILATERAL triangle