He wrote a work on the area of lunes, crescents formed from two intersecting circles, (see for example) and then wrote the first of two treatises on squaring the circle using lunes (see).
Siya wrote isang trabaho sa lugar ng lunes, crescents nabuo mula sa dalawang intersecting circles, (tingnan ang halimbawa) at pagkatapos ay ang unang wrote ng dalawang treatises sa squaring ang bilog gamit ang lunes (tingnan).