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# Can anyone help with TMUA 2016 paper 1 question 20 please? watch

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1. Can anyone help with TMUA 2016 paper 1 question 20 please?
2. Can you provide a picture?
3. (Original post by Y11_Maths)
Can you provide a picture?
4. The approach I would suggest is to imagine that the pyramid is made of paper. Then imagine detaching the base, cutting along the line OS, unfolding the four triangular faces and laying them flat. You will then have a flat shape consisting of four equilateral triangles, each joined to the next by one edge. If you label the flattened shape as per the original diagram, S will appear twice as that's where you cut the "paper".

Now you have a flat shape to work with, the shortest distance between P and the mid-point of OR will be a straight line between them. You can find the length of that line via the cosine rule.
5. THANK YOU so much

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Updated: February 11, 2018
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