AQA A Level Biology Heart

https://grobybio.weebly.com/uploads/2/6/2/3/26235017/practical_questions.pdf

For Q4b how did they get an answer of 15% please ? I got 9.5% by calculating the area of the lumen using pir2 r=0.8 =0.503 and by doing the area of the square 2.3x2.3=5.29 then dividing them and multiplying by 100?

Reply 1

Student2011584

To start with you're doing OCR questions but you're AQA. Not recommended. Did you measure from paper or from the screen? I haven't actually got any clue how to work it out as I havent measured it myself