At which latitude is polaris observed at an altitude of 66.5 degrees

The latitude at which the Polaris is observed at an "altitude of 66.5 degrees" is 66.5 degrees north latitude.

Explanation:

The Polaris, which is called the "North Star", can be observed from any point between the Equator and the North Pole. The "altitude of the North Star" visible from the point that you are standing at is apparently the degree measurement of the latitude. Thus, the latitude and the altitude of the Polaris are corresponding to each other.

A,f, g are the points