The diagram shows a cuboid ABCDEFGHABCDEFGHABCDEFGH.
AB=7 cmAB = 7 \text{ cm}AB=7 cm
AE=5 cmAE = 5 \text{ cm}AE=5 cm
AG=15 cmAG = 15 \text{ cm}AG=15 cm

Calculate the length of ADADAD.
Give your answer correct to 3 significant figures.
22 exam-style questions on Edexcel GCSE Maths 3d Pythagoras and Trigonometry. Each one has a worked solution and a mark scheme showing where the marks go.