Round 0.198 to three decimal places

Write the pair of fractions as a pair of fractions with a common denominator

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *