What sources of error are there in the experiment of measuring the sun's diameter with the cardboard and pin hole experiment?

Eastern europe and parts of northern europe have which of the following climates?

In which type of economy do the forces of supply and demand typically drive prices? a. a market economy b. a traditional economy a planned economy d. a command economy select the best answer from the choices provided. 0 0 em oo 0 0

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4