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## 'Three Tears' printed from http://nrich.maths.org/

Using only compasses and a straight edge, construct this design so
that each "tear" is $100 \; \text{cm}^2$.

So that your diagram is the right size you will need to calculate
one length, to get you started.

Do this as a single calculation, then take that result as the
initial setting for your compasses.

You can then create the design without further calculation or use
of a ruler

(a protractor is not necessary for any part of the process).