The diagram shows a cuboid-shaped water tank ABCDEFGHABCDEFGHABCDEFGH.
AE=2.5 mAE = 2.5 \text{ m}AE=2.5 m
AD=10 mAD = 10 \text{ m}AD=10 m
DC=25 mDC = 25 \text{ m}DC=25 m
Calculate the size of angle ECAECAECA.
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.