Calculate the length of BC. Round answer to the nearest centimeter.
tan(40o) = CD / AD ---> tan(40o) = CD / 10 ---> CD = 10 · tan(40o)
tan(30o) = BD / AD ---> tan(30o) = BD / 10 ---> BD = 10 · tan(30o)
Use a calculator to find the lengths of CD and BD and then add those two lengths together.