Geometry problems (40..49) problems 30..39 problems 50..59 40. Calculate the area of the square. 41. See quadrilateral ABCD with given angles. BC=DC. Calculate angle x. 42. Next picture consists of circle arcs. Prove that the red and blue shaded areas are equal. 43. Prove that in next picture: 44. Find formula for the blue area. 45. Calculate the area of quadrilateral ABCD. 46. ABCD is a square. Calculate length x of an edge. 47. prove that 48. prove that 49. calculate ratio