An antenna in a Geostationary satellite should have a minimum beam width of which among the following values to cover the entire earth?

Q. An antenna in a Geostationary satellite should have a minimum beam width of which among the following values to cover the entire earth?
Answer: 17.34°
Notes: The Geosynchronous satellite is located at 35865 kilometers away from earth. The global or earth coverage antenna should have a beam width of 17.34° to cover the entire earth.