The Shulbasutras of Baudhayana, Apastamba, Katyayana and Manava: With Text, English Translation and Commentary c8.t13.26

c8.t13.26

Then three squares *ABCD*, *EFGH* and *IJKL* are turned into circles of radii *OM*, *OP* and *ON* respectively, according to the method given in rule 2.9. The space between the felly and the nave, that is between the circles of radii *ON* and *OP* is radially divided into 32 equal parts and half of them, in alternate order, is removed. In this way, an area equivalent to that of 64 bricks is rejected, and the remaining area of the wheel with the nave, spokes and the felly is exactly equal to that of 225 bricks or 7½ sq. *pu.*