use a compass
Draw three circles that touch in a shape of a circle. Draw two small circles in each big one and another in the intersection. It is supposed to be a Venn Diagram.
trotting poles trotting circles(not small circles though)
small, closed circles
the shape of the bacteria cells are small circles
Small white circles are probably sebaceous cysts, also known as white-heads. Larger white circles could be frostbite scars.
You need some more information about any of the circles, or about the relationship between the two circles, to answer this question.
yes because one is smaller than the other
Historically, it is because we live on a planet which is approximately spherical. 2-dimensional trigonometry was adequate for relatively small shapes where the curvature of the earth had negligible effect. For larger shapes the spherical nature of the earth was important and therefore, so was spherical trigonometry.