Explanation:

Statement 1: If you were standing at the North Pole, the North Star would be directly above you. If you were standing at the Earth's equator, the North Star would be right along the horizon. If you measure the angle of the North Star above the horizon, that will be the same as your latitude. The North Pole is a latitude of 90 degrees north, and the equator is 0 degrees north. At the North Pole, the North Star is above, which is 90 degrees above the horizon. And, at the equator, the North Star is on the horizon, which is 0 degrees above the horizon.
Statement 2: If you look at the diagram above, you will notice that you can’t decide your longitude because the angle measurements from any longitude would be the same.