cos∠B=(a²+c²-b²)/2.a.c
cos∠B=(6²+5²-7²)/2.6.5
cos∠B=(36+25-49)/60
cos∠B=(61-49)/60
cos∠B=12/60
cos∠B=1/5
cos⁻¹(1/5)=78,46°
∠B=78,46°
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cos∠B=(a²+c²-b²)/2.a.c
cos∠B=(6²+5²-7²)/2.6.5
cos∠B=(36+25-49)/60
cos∠B=(61-49)/60
cos∠B=12/60
cos∠B=1/5
cos⁻¹(1/5)=78,46°
∠B=78,46°