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From Georgian Papers Programme Transcription Wiki
(23.)
rectangle under the sum & differnce of the same lines. or, aa+bb=a+b image x a-b image
Section III.
underline Definitions /underline
1. An arch or are of a circle is any portion of the circumference.
2. The chord addition h /addition or subtense of an unclear is the right line joying its extremes.
3. A segment of a circle is a figure contain'd under an are & its chord addition h /addition .
4. A sector of a circle is a figure contain'd under two semi-diameters & the are intercepted between them.
5. An angle in a segment in that which is contain'd by two right lines drawn from any point of the are
