1угол+4угол=180°
4угол=180°-141°
4уг=39°
4уг+3уг=180°
3уг=180°-39°
3уг=141°
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1угол+4угол=180°
4угол=180°-141°
4уг=39°
4уг+3уг=180°
3уг=180°-39°
3уг=141°