A semi-circular tunnel entrance has a cross-sectional area of 40 m2.
Find the perimeter of the tunnel entrance. Give your answer correct to one decimal place.
Area and Circumference of Circles Questions
Practise OCR GCSE Maths Area and Circumference of Circles with exam-style questions for Foundation and Higher tier. 47 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.