List three forms of radiations from the sun

What is the difference between external & internal migration

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

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.