What is the third number on the left of the tenth line of the Leibniz triangle?

What is the third number on the left of the tenth line of the Leibniz triangle?

The point of a blenitz triangle is equal to the sum of two angles
So line 8 is 8 / 1 56 / 1 168 / 1 280 / 1 280 / 1 168 / 1 56 / 1 8 / 1
Line 10 the third is 360 / 1