An isosceles triangle is a triangle with two congruent sides and congruent base angles. congruent means equal. No matter which direction the triangle's apex, or peak, points, it's an isosceles triangle if two of its sides are congruent.
Uses of talc: Talc is used in a wide variety of products that we see every day. It is an important ingredient in rubber, a filler and whitener in paint, a filler and brightening agent in high-quality papers, and a primary ingredient in many types of cosmetics.
I recently observed on a bottle of antacid - calcium supplement tablets that one of the ingredients is talc. Now as I recall, talc was widely used in Japan as a food additive to improve the texture of rice, until studies linked it with stomach cancer. I therefore wonder about the safety of food supplements that contain it.