Working out angles II 0 Overview Using this Resource Connecting to the Curriculum Marking Student Responses Working with Students Further Resources This task is about working out unknown angles. Question 1Change answer a) What is the size of the angle marked 'a'? degrees Question 1Change answer b) What is the size of the angle marked 'b'? degrees Question 1Change answer c) What is the size of the angle marked 'c'? degrees Question 1Change answer d) What is the sum of the five angles marked 'd', 'e', 'f', 'g', and 'h'? degrees Task administration: This task can be completed with pencil and paper or online (with auto marking displayed to students). Level: 5 Curriculum info: Maths, Geometry and Measurement, Shape Keywords: interior angles, polygons Description of task: Students use their knowledge of the sum of the interior angles of polygons to work out unknown angles for a variety of 2-dimensional shapes. Learning Progression FrameworksThis resource can provide evidence of learning associated with Geometric thinking, set 6 within the Mathematics Learning Progressions Frameworks.Read more about the Learning Progressions Frameworks. Answers/responses: Y10 (10/1998) a) 77 very easy b) 110 very easy c) 85 easy e) 540 difficult Diagnostic and formative information: Common error Likely reason a) - d) Close to true answer. Measuring angles with protractor rather than calculating them. d) 360 72 Sum of exterior angles. Sum of exterior angles ÷ 5. Working out angles Sum of the angles Working out angles III Street angles Angles of an octagon Angles of a hexagon Inside a triangular prism Inside a cube Inside a rectangular prism
