PLANE GEOMETRY - Triangles In this video, we study triangles. We will cover: Classification according to sides: (equilateral, isosceles and scalene triangle) Classification according to angles (right triangle, acute and obtuse triangle) Condition for the existence of a triangle Thales' angular theorem Exterior angle theorem Cases of triangle congruence Also watch Primitive Concepts and Initial Definitions - PLANE GEOMETRY (class 01) • ⭕ Primitive Concepts and Initial Definitions... Angles - PLANE GEOMETRY (class 02) • ⭕ Angles - PLANE GEOMETRY (class 02) Exercises on angles - PLANE GEOMETRY (class 03) • ⭕ Exercises on angles - PLANE GEOMETRY... Parallels Intercepted by a Transversal - PLANE GEOMETRY (Class 04) • ⭕ Parallels Intercepted by a Transversal... Triangles - PLANE GEOMETRY (Lesson 05) • ⭕ Triangles - PLANE GEOMETRY (Lesson 05) Notable Points of the Triangle - PLANE GEOMETRY (Lesson 06) • ⭕ Notable Points of the Triangle - GEOM... Quadrilaterals - Trapezoid - PLANE GEOMETRY (Lesson 07) • ⭕ Quadrilaterals - Trapezoid - PLANE GEOMETRY... Parallelograms - PLANE GEOMETRY (Lesson 08) • ⭕ Parallelograms - PLANE GEOMETRY (Lesson 09) • ⭕ Rectangle, Rhombus and Square - PLANE GEOMETRY (Lesson 09) • ⭕ Rectangle, Rhombus and Square - GEO... Polygons - PLANE GEOMETRY (Lesson 10) • ⭕ Polygons - PLANE GEOMETRY (Lesson 10) Thales' Theorem - PLANE GEOMETRY (Lesson 11) • ⭕ Thales' Theorem - PLANE GEOMETRY ... Similarity of Triangles - PLANE GEOMETRY (Lesson 12) • ⭕ Similarity of Triangles - PLANE GEOMETRY ... Metric Relations in the Right Triangle (Demonstration and Exercises) - PLANE GEOMETRY (Lesson 13) • ⭕ Metric Relations in the Right Triangle ... Law of Sines - PLANE GEOMETRY (Lesson 14) • ⭕ Law of Sines - PLANE GEOMETRY (Au... Law of Cosines - PLANE GEOMETRY (Lesson 15) • ⭕ Law of Cosines - PLANE GEOMETRY ... Stewart's Relation - PLANE GEOMETRY (Lesson 16) • ⭕ Stewart's Relation - PLANE GEOMETRY ... Circle and Circumference (Part 1) - PLANE GEOMETRY (Lesson 17) • ⭕ Circle and Circumference (Part 1) ... Circle and Circumference (Part 2) - PITOT'S THEOREM - PLANE GEOMETRY (Lesson 18) • ⭕ Circle and Circumference (Part 2) ... Circle and Circumference (Part 3) - EXERCISES - PLANE GEOMETRY (Lesson 19) • ⭕ Circle and Circumference (Part 3) ... Angles in the Circumference - PLANE GEOMETRY (Lesson 20) • ⭕ Angles in the Circumference - GEOMETR... Regular Polygons (Part 1) - PLANE GEOMETRY (Lesson 21) • ⭕ Regular Polygons (Part 1) - GEO... Regular Polygons (Part 2) Inscribed (apothem and side) - PLANE GEOMETRY (Lesson 22) • ⭕ Regular Polygons (Part 2) Inscribed... Regular Polygons (Part 3) Circumscribed (apothem and side) - PLANE GEOMETRY (Lesson 23) • ⭕ Regular Polygons (Part 3) Circum... Power of a Point - PLANE GEOMETRY (Lesson 24) • ⭕ Power of a Point - PLANE GEOMETRY... Length of the Circumference (with exercises) - PLANE GEOMETRY (Lesson 25) • ⭕ Length of the Circumference (with ... Area of ​​Polygons - PLANE GEOMETRY (Lesson 26) • ⭕ Area of ​​Polygons - PLANE GEOMETRY... Area of ​​Triangles - PLANE GEOMETRY (Lesson 27) • ⭕ Area of Triangles - PLANE GEOMETRY... Area of ​​a Circle and its Parts - PLANE GEOMETRY (Lesson 28) • ⭕ Area of ​​a Circle and its Parts - ...