22/07/2018
Triangles By Rajesh Lamba Sir
Lesson – 1
https://unacademy.com/lesson/overview-in-hindi/UMAKVEXA
Lesson – 2
https://unacademy.com/lesson/overview-2-in-hindi/5JZQPY5O
Lesson – 3
https://unacademy.com/lesson/triangle-lesson-3-in-hindi/F9YD03TW
Lesson – 4
https://unacademy.com/lesson/triangle-lesson-4-in-hindi/W7S6G4MW
Lesson – 5
https://unacademy.com/lesson/triangle-lesson-5-in-hindi/WRWC18WA
Lesson – 6
https://unacademy.com/lesson/triangle-lesson-6-in-hindi/DEP5JWO6
Lesson – 7
https://unacademy.com/lesson/triangle-lesson-7-in-hindi/AC94ODY1
INCENTRE A point where angle bisectors of triangle meet is called Incentre. Here a circle is inscribed in a triangle of centre (I) and radius r. ie. Centre = Incentre radius r inradius Area of triangle = 2 r P Here r = inradius, P = Perimeter = a + b + c