Hello,

I need some help with these questions.

3.12: I don't know how to start

3.16: I divided the right part of the trapezoid into a 30-60-90 triangle and calculated the height, but I don't know how to solve it from there. I tried extending the sides BA and CD, and I tried using the area  (it led to an identity), and I don't know the cos(50) or otherwise I would've used that to solve the problem.

Thanks,

Tina Jin