Two circles share a common chord PQ. The chord cuts off a 90 degree arc of circle A and a 90 degree arc of circle B. If the area of quadrilateral ABPQ is 4, find the combined area of the gray regions.
Two circles share a common chord PQ. The chord cuts off a 90 degree arc of circle A and a 90 degree arc of circle B. If the area of quadrilateral APBQ is 4, find the combined area of the gray regions.
