What's the critical error seen in the geocentric model of the solar system exhibited here

Compare the quantity in column a with the quantity in column b. pa p a is tangent to the circle at a. column a column b ap a p ax a x question 4 options: the two quantities are equal. the quantity in column a is greater. the relationship cannot be determined from the information given. the quantity in column b is greater.

Because its government strictly controls its economy, north korea has a economy. a. command b. mixed c. traditional d. free market

Can someone answer all these questions i need it done by tonight. once again