Срочно помагите!!!!!!!!

Question

Срочно помагите!!!!!!!!

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Answer 1

RS=7x

RT=TS=4x

PΔ=RT+TS+RS

45=4x+4x+7x

45=15x

15x=45

x=45/15

x=3

RS=7*3=21, ST=4*3=12, RT=4*3=12