Hello, Triangle is the most stable figure it of the world. Triangles are indeed an important part of our daily life whether we notice them or not. read more
Connect your knowledge of angles to triangles and get introduced to significant theorems including the Triangle Angle Sum Theorem and the Exterior Angle Theorem. Congruent Triangles. Main Lesson: Congruent Triangles. With the help of CPCTC and the Third Angles Theorem, learn how to prove that triangles are congruent. read more
A triangle is important because all polygons can be broken into triangles, so triangle theorems can be used to solve problems involving greater-sided polygons. Triangles are also the polygons with the least number of sides, so they are easy to use when building generalizations about larger figures. read more