In the diagram above, \(BD = 5, CD = 10,\) and \(AE = 40.\) What is the area of the shaded region?

[Vincen]

In the diagram above, \(BD = 5, CD = 10,\) and \(AE = 40.\) What is the area of the shaded region?

(A) 175
(B) 350
(C) 775
(D) 1150
(E) 1575

[spoiler]OA=E[/spoiler]

Source: Magoosh