How many points are there on the globe where by walking one mile south, one mile east and one mile north you reach the place where you started ??
Just two, south pole and north pole.
This is also a unique case when sum of all angles of a triangle is more then 180 because we deal in the spherical form of the world.
How many squares are there in this picture?
There are 20 points arranged in a cross pattern shown below. How many squares can be drawn, using any 4 points as corners?
What’s going on in this figure? How is there a missing square?
