The diagram shows a cuboid ABCDEFGHABCDEFGHABCDEFGH.
AE=4 cmAE = 4 \text{ cm}AE=4 cm
AD=5 cmAD = 5 \text{ cm}AD=5 cm
DC=8 cmDC = 8 \text{ cm}DC=8 cm
Calculate the size of angle ECAECAECA.
Give your answer correct to 3 significant figures.
22 exam-style questions on AQA GCSE Maths 3d Pythagoras and Trigonometry. Each one has a worked solution and a mark scheme showing where the marks go.