I don't understand the given answer to the final question on this paper!! Does anyone remember this one from having looked at past papers? I'll write it out here...
The diagram shows a circle with circumference of 1cm being rolled around an equilateral triangle with sides of length 1cm.
How may complete turns does the circle make as it rolls around the triangle (without slipping) to its original starting position?
What do you think??
I would have thought 3.. is that the answer?
the circumference of the circle is one cm and hence if rolled round the edges would go 1cm to get it back a complete circle. The total length of the sides of the triangle is 3cms so 3 revolutions?