[No] and 10 + 10 = 20 or 20 ÷ 2 = 10 and recognition that height is 0 or not included oe
2
B1 for each
See appendix Accept \(10 \times 2 = 20\) (unless clearly implying area) Accept e.g. “adding lengths makes 20” for 10 + 10 = 20 B0 B1 and B1 B0 are possible
Appendix
Question 17b
Statement
Reason
Mark
[No as] the length is 10 cm, the top and bottom would already add to 20 cm
BOD 10 + 10 = 20 and ALREADY implies 0 cm for other sides
2
[No.] To find the perimeter, you add up all of the sides and 10 + 10 = 20 which does not include the 2 extra sides
Sum seen for B1. Recognises other sides not included
2
2 lengths make 20 so any width would be more than 20
Sum implied for B1 Recognises other sides not included
