1. The center is the hole through which the thread
And it may be called a pole so pay heed
١. المركز الثقب الَّذي الخَيط بِهِ
وَقَد يسمّى قطباً فاِنتبِه
2. And the arc of altitude is what surrounds
A quarter of the circle's lines abound
٢. وَقَوس الاِرتفاع ما تُحيطُ
بِالربع مِن دائِرَة خُطوط