INTRODUCING 5 - days-a-week problem solving session for Math Olympiad and ISI Entrance. Learn More

Watch the solution of an interesting problem on Triangles on a sphere and learn how to solve it. You may try the problem yourself and then watch the video.

Suppose the earth is a perfect sphere. You are on its surface at point A. First, you walk 1 mile south, then 1 mile east and finally 1 mile north. And voila! *You find yourself at point A again*. Can you find such a point A on the earth's surface?

Advanced Mathematical Science. Taught by olympians, researchers and true masters of the subject.

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