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.
Practise Edexcel GCSE Maths 3d Pythagoras and Trigonometry with exam-style questions for Foundation and Higher tier. 28 questions, matched to the Edexcel GCSE Maths (1MA1) 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.