AB=8, BC=15, ∠B=60° (sin60=√3/2; cos60=1/2)
т косинусов
AC^2 =AB^2 +BC^2 -2AB*BC cosB =64+225-120 =169 => AC=13
т синусов
AC/sinB =2R => R =13/√3 (см)
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Verified answer
AB=8, BC=15, ∠B=60° (sin60=√3/2; cos60=1/2)
т косинусов
AC^2 =AB^2 +BC^2 -2AB*BC cosB =64+225-120 =169 => AC=13
т синусов
AC/sinB =2R => R =13/√3 (см)