The sum of the interior angles of a polygon is twice the sum of its exterior angles. How many sides does the polygon have?
8 sides
9 sides
12 sides
6 sides
Next Question
Two trains of equal length 120 metres move in the same direction. The faster train completely overtakes the slower one in 15 seconds. If the slower train were to move at half its speed, the over taking would take in 10 seconds. At what speeds are the 2 trains moving (faster and slower respectively in m/s)