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ulana832
@ulana832
November 2021
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ПОМОГИТЕ ПОЖАЛУЙСТА ГЕОМЕТРИЯ 9 КЛАСС
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армения2017
<А=120° АВ=4. <С=90°. СD=x
тр.АВD
BD^2=16+25-2•4•5• cos120°
=61
тр.ВСD BD^2=36+x^2
x^2=61-36=25
x=5
ответ 6+4+5+5=20
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Answers & Comments
тр.АВD
BD^2=16+25-2•4•5• cos120°
=61
тр.ВСD BD^2=36+x^2
x^2=61-36=25
x=5
ответ 6+4+5+5=20