Срочно !!!!!!!!!!!!!!срочно

Question

Срочно !!!!!!!!!!!!!!срочно

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Answer 1

2R= a/ sinx
x=30
sin30= 1/2
2R=a/sin30
2R= 3/ 1/2
2R=6
R=3

Answer 2

A/sina=2R
R=a/2sina
R=3:(2*1/2)=3:1
R=3