问题:
已知梯形ABCD内接于⊙O,AB ∥CD,AB=8cm,CD=6cm,⊙O的半径为5cm,则S 梯形ABCD=______.
已知梯形ABCD内接于⊙O,AB ∥CD,AB=8cm,CD=6cm,⊙O的半径为5cm,则S 梯形ABCD=______.
参考答案: