1. Draw an equilateral triangle
2. Extrend its sides.
3. Using 1 as the centre and 1-3 as the radius, draw the arc 3-A.
4. Using 2 as the centre and 2-A as the radius, draw the arc A-B.
5. Using 3 as the centre and 3-B as the radius, draw the arc B-C.
