Question

ex. 3 va rog .................


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Answer 1

Notăm cu x=<DOE

y=<EOF

z=<FOD

x,y,z i.p. cu 12,15,20. => 12x=15y=20z=k. =>x=k/12,y=k/15,z=k/20=> k/12+k/15+k/20=360⁰ => 5k+4k+3k/60=360 => 12k=21600 =>k=1800.

x=150⁰=<DOE=arculDE

y=120⁰=<EOF=arcul EF

z=90⁰=<FOD=arcul FD