The diagram shows two right-angled triangles, ABC ABC\,ABC and ACDACDACD.
AB=20 cmAB = 20\text{ cm}AB=20 cm, BC=12 cmBC = 12\text{ cm}BC=12 cm and CD=9 cmCD = 9\text{ cm}CD=9 cm.
Calculate the length of ADADAD.
Give your answer to 3 significant figures.
Pythagoras Questions
Practise AQA GCSE Maths Pythagoras with exam-style questions for Foundation and Higher tier. 55 questions, matched to the AQA GCSE Maths (8300) specification and written in Paper 1, Paper 2 and Paper 3 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.