9000120007
Level:
B
On a map of a city, the town hall is represented by a point and a river through the
city by a straight line. There are places in the city with the property that the direct
distance from each place to the town hall is equal to the direct distance to the river.
In the following list identify a curve which can be used to join all these places.
parabola
circle
ellipse
hyperbola
none of them