A cylindrical helix is just a spiral on a cylinder, like an ordinary spring or the thread on a bolt. If I turn a left-handed helix over (top to bottom) does it become a right handed helix?
Stage: 3 Challenge Level:
Turn the triangle of area 0.5bh into a rectangle of dimensions b
by 0.5h using the midpoints of edges. The square has side length
given by s2
= 0.5bh. There is a lot to explain here
about why the pieces fit exactly as shown.
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NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities
can be found here.