Chipboard in place

The walls are now in place. I identified a centre point on the flooring, and measured 2.35m from it in twenty four directions, to mark out a circle with a 4.7m diameter (the circumference is 15 metres) in masking tape. With help from Onion and Vickram I then moved the boards, which are fixed in pairs to the edge, and was attempting to measure the angle using a set square, until Onion pointed out that because the circle is correctly measured, I just needed to make sure the edges of the boards were touching the masking tape for it to be perfect without the hassle. This simple piece of logic utterly floored me, and surely enough everything was at the needed 150 degree angle. I redrew the screws between the six sets of twos to complete the structure.