Дано. треуг. ABC и треуг. A1B1C1,угол С=С1, угол А=A1

a) AC=5cm, AB=15

A1C1=8, A1B1=?

d) A1C1=4 cm, A1B1=7 cm

AB=21 AC=?

угол А=A1 =cos A=cos A1

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