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Updated: May 24, 2025
The two theorems, that the internal angles of every right-line triangle are equal to two right angles, and that the square of the hypothenuse of every right angled triangle is equal to the sum of the squares of the other two sides, are ascribed to him.
This Chapman's book does to the best purpose possible under the circumstances, in what is technically termed the right-line system of drawing, that is, the reduction of all forms to their approximate geometrical figures in order to facilitate the measurements of the eye.
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