0 0 votes A certain city has a circular wall around it, and this wall has four gates pointing north, south, east and west. A house stands outside the city, three km north of the north gate, and it can just be seen from a point nine km east of the south gate. What is the diameter of the wall what surrounds the city? $6$ km $9$ km $12$ km None of these Quantitative Aptitude cat2001 quantitative-aptitude geometry + – go_editor 14.2k points 1.7k views answer comment Share Follow Print 0 reply Please log in or register to add a comment.