6. Step 4: Join the square’s diagonals through the centre point A
7. Step 5: Scribe arcs with radius 65mm across the diagonals
8. Step 6: Inscribe circles radius 50mm on the original centre lines at B C D and E so that they fit exactly within the first circle. Terminate circles where they intersect
9. Step 7: Duplicate circles using the same centres B C D and E and radius 45mm. Terminate circles where they intersect with the arcs drawn in Step 5
10. Step 8: Clean up construction lines and darken outlines