The two polygons are similar. Find measure of angle C

Convert 16 yards to feet use the conversion rate 3 feet = 1 yard

(a) compute the maclaurin polynomial m2(x) for f(x) = cos x. (b) use the polynomial of part (a) to estimate cos π 12. (c) use a calculator to compute the error made using the estimate from part (b) for the value of cos π 12. remember that the error is defined to be the absolute value of the difference between the true value and the estimate.

How do you use the elimination method for this question? explain, because i really want to understand!