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In triangle ABC, find sin A if b = 2*sqrt(10), c = 11, and a = 9.

 Sep 13, 2021
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In triangle ABC, find sin A if b = 2*sqrt(10), c = 11, and a = 9.

 

Hello Guest!

 

a2=b2+c22bc cosAcosA=b2+c2a22bc=410+11292211210=804410=201110

sinA=1cos2A=140012110=81121sinA=911=0.¯18

laugh  !

 Sep 14, 2021
edited by asinus  Sep 14, 2021
edited by asinus  Sep 14, 2021
edited by asinus  Sep 14, 2021

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