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'Rectangular Pyramids' printed from https://nrich.maths.org/
Is it true that $p^2+q^2=s^2+r^2$ when:
- the rectangle $ABCD$ and the point $V$ are in the same plane? (Working in 2D).
- $ABCD$ represents a pyramid, with vertex $V$, on a rectangular base $ABCD$? (Working in 3D).
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