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Sir pls solve the following.
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Asked by rsudipto | 05 Jan, 2019, 09:19: AM
answered-by-expert Expert Answer
begin mathsize 16px style straight a squared plus straight b squared plus straight c squared equals 8 straight R squared
Using space sin space rule
sin squared straight A plus sin squared straight B plus sin squared straight C equals 2
sin squared straight A plus 1 minus cos squared straight B plus 1 minus cos squared straight C equals 2
minus cos squared straight B minus cos squared straight C plus sin squared straight A equals 0
cos squared straight B plus cos squared straight C minus sin squared straight A equals 0
cos squared straight B plus cos open parentheses straight C plus straight A close parentheses cos open parentheses straight C minus straight A close parentheses equals 0
minus cosB left square bracket negative cosB plus cos left parenthesis straight C minus straight A right parenthesis right square bracket equals 0
minus 2 cosBcosCcosA equals 0
hence comma space one space of space the space angle space of space straight a space triangle space should space be space 90 degree.
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