Level:
Project ID:
1103076903
Source Problem:
Accepted:
1
Clonable:
1
Easy:
1
Which of the following formulas applies to the given triangle \( ABC \)? (See the picture.)
\( a^2 = b^2+c^2 -2bc\cos\alpha \)
\( b^2 = a^2 + c^2 - 2bc\cos\alpha \)
\( a^2 = b^2 +c^2-2bc\cos\gamma \)
\( a^2 = b^2+c^2+2bc\cos\alpha \)