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This worksheet provides six challenging problems that will involve learners using Pythagoras' Theorem to find missing lengths of 3D shapes. The shapes in this worksheet consist of cubes, triangular prisms and a square based pyramid. Some of the questions also involve the volume of the shape so learners may need to know the volume formulae and be able to work backwards if given the volume. You can find more questions in 3D Pythagoras (B).