Total ratio = 2 + 3 + 5 = 10 Sum of angles in a quadrilateral is 360 4th angle = 130 360 - 130 = 230 Sum of remaining 3 angles must be equal to 230 1st angle 2/10 * 230 = 46 2nd angle 3/10 * 230 = 69 3rd angle 5/10 * 230 = 115 Adding all angles together 46 + 69 +115 + 130 = 360