The Wilayat of Al-Khuwair has an area of 2500 square kilometers and is covered by a cellular system using a twelve-cell reuse pattern. Al-Khuwair is allocated 60 MHz of the spectrum which uses a Full-duplex channel of 70 kHz for voice and control channels. Each cell has an area of 50 square kilometers. Calculate; 1. the radius of each cell. (1.5 marks) 15 minutes 2. the number of cells in Al-Khuwair. (1 mark) 3. the total number of channels per cell (1 mark) 4. number of clusters (1.5 marks)