2D Area & Perimeter: WJEC GCSE Intermediate November 2016 Unit 2 Q9

Intermediate November 2016 Unit 2 Q9

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

A square has a perimeter of 80 cm.
A circle fits exactly inside the square, as shown in the diagram.

Calculate the circumference of the circle.
Give your answer correct to 1 decimal place.
You must show your working. [4 + 2 OCW]

Mark scheme

Scheme	Marks	Comments
(Diameter of circle = ) 80 ÷4	M1
= 20(cm)	A1	May be seen on the diagram as a side or a diameter. Radius (or ‘½ a side’) =10; stated, used or seen on the diagram implies M1A1.
(Circumference =) π×20 or 2×π×10 or equivalent	M1	F.T. ‘their derived diameter (not 10 and not 80) or derived radius(not 20 and not 80).
= 62·8(cm)	A1	Must be given to 1dp.
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
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.