anastasiagumenuk anastasiagumenuk

17-05-2020
Mathematics

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СРОЧНО НАДО ПОМОГИТЕ

дві сторони трикутників дорівнюють 6 см і 10 см ,а кут між ними дорівнює 120 градусов.Знайдіть периметр трикутника/

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nktselepov nktselepov

17-05-2020

Третю сторону знаходимо по теоремі косинусів

х²=6²+10²-2·6·10·cos120°=36+100-120·(-0,5)=196.

х=14 см.

Р=6+10+14=30 см.

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