Angles (Including Parallel Lines): WJEC GCSE Intermediate November 2022 Unit 2 Q3

Intermediate November 2022 Unit 2 Q3

3. In this question, you will be assessed on the quality of your organisation, communication and accuracy in writing.

In the diagram below, AF is a straight line.

Diagram not drawn to scale

Calculate the size of angle \(x\).
You must show all your working. [4 + 2 OCW]

Mark scheme

Scheme	Marks	Comments
(Angle EBC = 180 – 112 = ) 68 (°)	B1	Check diagram for answers.
(Angle BED or Angle AED =) 360 – (123 + 110 + 68) or equivalent	M1	Award M1 for complete method to find Angle BED or intention of complete method provided not contradicted e.g. 360 – 123 + 110 + 68 with 123 + 110 + 68 added incorrectly but attempt to subtract from 360. FT 360 – (123 + 110 + ‘their 68’), provided ‘their 68’: ≠ 112 and < 127.
59 (°)	A1
\(x\) = 121 (°)	B1	FT 180(°) – ‘their derived 59(°)’, provided < 180 Unsupported answer (may be on diagram) is awarded B1M1A1B1.
Organisation and Communication.	OC1	For OC1, candidates will be expected to: present their response in a structured way explain to the reader what they are doing at each step of their response lay out their explanation and working in a way that is clear and logical write a conclusion that draws together their results and explains what their answer means
Accuracy of writing.	W1	For W1, candidates will be expected to: show all their working make few, if any, errors in spelling, punctuation and grammar use correct mathematical form in their working use appropriate terminology, units, etc