The school task:
Love tones are heard at a distance of 12 meters, Zinuli at a distance of 9 meters, and Katenko stands so quietly that it can be heard only three meters away. In a quiet night, all three girls decided to sit with their cavalry in a clean field, and so as to be as close as possible, but not to hear each other's love sounds. Determine the angles of the triangle formed by three loving couples. Draw this triangle on a millimetre scale of one centimeter one meter of pure field.