round the answers solve the triangles A = 42 degrees, B = 61 degrees, a = 12 i solved for the other 2, C and b, but for c on the answer sheet it says 17 but when solving with my calculator it gave me 18.31489... could I have made any errors or the answer sheet gave an error

Polygon with three sides, three angles, and three vertices. Based on the properties of each side, the types of triangles are scalene (triangle with three three different lengths and three different angles), isosceles (angle with two equal sides and two equal angles), and equilateral (three equal sides and three angles of 60°). The types of angles are acute (less than 90°); obtuse (greater than 90°); and right (90°).