If $\alpha, \beta\: and\: \gamma$ are the… | ClassNotes

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If $\alpha, \beta\: and\: \gamma$ are the… | ClassNotes

E

Editor

Sep 18, 2022

If $\alpha, \beta\: and\: \gamma$ are the corresponding angles of the sides a, b and c respectively in an oblique triangle, then according to law of cosins, the value of the square of the side a is

Difficulty: Easy

A:

a^{2}=a^{2}+b^{2}-2ab\cos\alpha

B:

a^{2}=a^{2}+b^{2}-ab\cos\alpha

C:

b^{2}=b^{2}+c^{2}-2ab\cos\alpha

D:

b^{2}=b^{2}+c^{2}-2bc\cos\alpha

ID: 63273db9ca83163ac3a11967