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if A,B,C are angles of a triangle prove that cosA + cosB + cosC = 1 + r/R

Ayush Oberoi , 8 Years ago
Grade 11
anser 2 Answers
Saurabh Koranglekar

Last Activity: 5 Years ago

Dear student

Using the standard result

576-1066_Screenshot_2019-09-29-21-00-05-246_com.android.chrome.png

Vikas TU

Last Activity: 5 Years ago

Dear student 
CosA + CosB +CosC = 1 + 4 SinA/2 *SinB/2 *SinC/2
=> 1+ 4R SinA/2 *SinB/2 *SinC/2
=> 1+ r/R 
Hence prooved 
 

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