Theorem. "7 circle rate exactly, or the same circle. If the arc of equal length and angle in the circle arc compatible with arc, are of the same size
.Theorem. "8 circle rate exactly, or the same circle. If คอร์ดส her neck card of equal length and both will cut circular arc chord make less equal length. And the greater curvature of equal length
.Theorem. "9 circle rate exactly, or the same circle. If คอร์ดส her neck card circle cutting make arc less equal length arc large and equal length. Both are of equal length and chord
.He 10 theorem "segment, which pass through the center of a circle and cut the chords not diameter are as follows:
1, treasure. If the line segment is perpendicular to the straight line is half chords and chord
2.If the line segment half chords and parts of the event at perpendicular to a chord.
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