The total area of 333 blades of a fan is \dfrac{5}{2}\pi\,\text{m}^2 2 5 πm 2 start fraction, 5, divided by, 2, end fraction, pi, start text, m, end text, squared. Two of the blades form an angle of 30\degree30°30, degree and the third blade forms an angle of 40\degree40°40, degree at the center.

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.