Answer:
CIRCLE : CIRCLE
Ratio of area is the scale factor squared. So find the radii of the two circles, square both values, and simplify the ratio.
SQUARE : SQUARE
Ratio of area is the scale factor squared, So find the side lengths of the two squares, square both values, and simplify the ratio.
SQUARE : CIRCLE
Using the formulas A = s*s and A = pi*r^2, find the areas of the circle and the square. Then simplify the ratio.