Area of the crescent between two circles?

Two circles meet each other to form a crescent. At the point where the circles meet draw a diameter (line - say vertical in our case if circle meet at the top point). Draw another diameter (horizontal) perpendicular to the first diameter line through the centre of the larger circle. If the difference in dia of the two circles is 9 cm and the horizontal distance measured on one side along the horizontal diameter between the circles is 5 cm (each side is 5 cm) What is the area of the crescent formed between 2 circles. I would like a detailed answer.