Trapezoid and Circle

Welcome! You are encouraged to register with the site and login (for free). When you register, you support the site and your question history is saved.

In the figure above, EF is a diameter of the circle with center O and is tangent at each end to the trapezoid ABCD. If the area of the circle is , the length of AD is 20 and the length of BC is 10, what is the area of the ABCD?