Principle Of Mathematical Induction

Question
CBSEENMA11013577

In triangle ABC, if b = 15 cm, space space cosB space equals space 4 over 5 comma   find R.

Solution

b = 15 cm,        space space cos space straight B space equals space 4 over 5
rightwards double arrow                       sinB space equals space square root of 1 minus cos squared straight B end root space equals space square root of 1 minus 16 over 25 end root space equals space 3 over 5
Now,                  straight a over sinA space equals space straight b over sinB space equals space straight c over sinC space equals space 2 straight R
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